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Maybe it's the boots, or the fit, or both. You may want to try another pair.
I've had countless boots over the years, from nameless el cheapos to high $ name brands, and never have a single case of blister. Nor any members of my (diving) family, nor any buddies I've dived with.
Unless you're kicking as if your life depends on it, but then you're using too much air...
I had problems with getting abrasions on the tops of my toes after extensive diving. I just picked up a couple of lycra socks. I stick those on and then my boots. I have not had any problems since I started using them. The lycra is a slick fabric so it allows the toes to just slide rather than chafe. The socks last pretty well too. I think I have something like 80 dives on em and no noticeable wear.