[laminar]

Juha,

The mouth-fill is a skill that is challenging at first and can always be improved. So fill your lungs or limit your depth so that you don't get terribly squished but not so full that you can easily draw air out of your lungs to equalize. I usually use a little less than a neutral breath. Get into the habit of doing it on recreational dives to shallower depths on a full lung (no packing) to make it second nature. The constant pressure against a nose clip is THE way to freedive.

Steve,

I don't really understand why you want to use a mask until it stops you from equalizing. Ear/mask squeeze can sneak up on you during a constant ballast dive--let alone a no limits dive when you're going down much faster. Diving with goggles is much more relaxing and a different experience than with a mask. If that's what you plan to use below 100m then why not train with it at shallower depths to get used to it?
I do support you in your approach to freediving--master skills at each level. Any fool can jump on a sled and take risks. It takes someone who appreciates the sport to learn all he or she can learn. Respect.


cheers,
Pete