Very nice, Mar. Can't say the same about my own lately, especially free immersion.
I had a bad inverted equalization problem, although I had no problem upright and could even do it hand free.  I researched it for months and purchased and practiced on an inversion machine.  It took me about 8 months to master and I still have to practice twice a week.
The moment I think I have it, I will have problems again. Beyond frustrating!

 

yeah but inversion machines won't properly train your epiglottis to stay CLOSED.

sounds like air that you're  trying to preserve in your mouthfills for equalizing past failure depth is rushing back to your lungs.

and it doesn't matter how much O2 you've packed.. after 30 meters as you go deeper the pressure in your lungs will always be below the pressure in your mouth. you need to close that epiglottis TIGHT.and press that air into your ear with your cheeks.


 

I AM PRIMING my throat to do a Frenzel, but it takes an extreme effort to force air into my ears while trying to equalize 80m+ dives.  I'm starting to wonder if I might have some scarring in my middle ear.  I have broken my eardrum twice the past several years.  The problem only happens for me during hands-free single mouthfill inverted EQ. 

Looking more and more like I may not be declaring any NL bp's for myself this year,  until I can sort this out.
 

try this..use a frenzel to equalize to 35m (inverted variable) then a valsalva at around 65m (should take yu to around 80m+)
-with valsalva, the built up pressure in the middle ear will be adequate enough *and all that's needed really to open the eustachian tubes to let air out of the middle ear and into the thorax.good luck

and get a spiro-meter test done too.  wouldn't hurt to have someone test/calculate the residual volume of your lungs. also, calculate the volume of the equalized sinuses+ ears+ mask and don't forget  *include volumne of equalized mask space too!!
you can always go my route and learn the sinus flooding technique for anything 60m+. *train using hydrogen peroxide. if you find your not disorientated/dizzy, than proceed to train in saline. *course you'll never be able to use this technique anywhere else but the ocean...lakes, quarries and pools are too bacterial for passive nasal flooding
 

 

read his post. he thinks it's middle ear scarring. no depth dives there if thats so

 

Here are my lung capacity results from the spirometer test my doctor performed: 
FEV1 4.83ltrs (128%);
FVC 6.73ltrs (149%);
FEV1/FVC 72 (base) 92 (max);
Lung Age Less than <20yrs

I've booked another test in 2 months time to compare the results as I change training routines, returning back to dry statics and pool training. I did manage several good  65m CWNF's and CWF this week. Oh yeah. And I have an NL slated for next week.  Fingers crossed.
 

now  take your surface lung volume and go calculate your mask equalization using a basic freediving mask volume test...
*to equalize 100 ml of mask air volume (about 2/3 of an average mask volume) at a depth of 60m requires 500 ml (0.5 liters) of surface lung volume (that's roughly about 10% of the average human being total lung capacity)

for NL, you'll want the lowest volumne mask possible (EVEN LOWER than 140 volume) .
and with your dives being deeper than 65m,  150 ml of mask it's a lot to equalize.
would be great if your inverted EQ problem stemmed from mask eq inadequacy *cause that's something so fixable.
 
it's no lie, the tighter the mask and the more squished and fuggied up the face that gets plied/pushed/poured  into it , the less mask volume to equalize and worry about.
*i look like an alien, a  fly, and a marty feldman in all of mine.
**enjoy your NL sets too :-)

 

Cringing just thinking about the mask squeeze with those low volume masks.
Well, my Seac Extreme mask has a value of 155ml volume , and both my  Technisub Falco and  Technisub Sphera each measured a 140ml volume.  Didn't expect my Seacs to measure that high a value though.  Of my three masks, it's lens are set the most closest to my eyes.

I'll send you my NL dive logs when we chat :)

 

 

Impressive outcomes!  Your narcing  is minimal  really, given  the cool water temps you endured there. I know you'll disagree but i think you're hypoxic  (because of where you grew up as a kid). Nothing wrond with that, folks pay big money to train at altitude. We have  fella in our club who has  relocated to Columbia, South America to train at altitude.





 

ceb, i could very well be hypoxic. ten years ago my doctor did bloodwork on me, said i was anemic cause my red blood cells were small and prescribed me ferrous fumarate (iron). she did follow up bloodwork and was puzzeled to see i still has small red blood cells.

she sent me to this blood specialist who ran further tests. his findings revealed i wasn't anemic, but rather had an abundance of very small red blood cells cause of genetics. he said something most interesting. somewhere in my ancestry there must have been malaria and for reasons of genetics /survival the red blood cells muted into muliples of smaller ones and have remained genetically speaking

he said this phenomena occurred mostly in regions of asia, especially the middle-east's bedouins nomadic tribes who hopscotched from one mountain to another
*WTF!! like my family-tree  doesn't need more crazy-craxy!