The way I see it wrt structures
Bounty builders fine as they are, sure they are somewhat less deep but still very playable
Rebuys are actually very good as far as I can see
Turbos great as well
Hypers stayed the same, which is fine
Regspeed mtt's (including progko) good as well
The biggest red flag are just the bigs imho. This went from being the best structured mtt's towards the worst ones. I think you've really underestimated/or overestimated better the effect of a 5k starting stack. Avg is just too small in endgames now. You seem to forget the structure in the bigs also had all his 'inbetween-levels' cut, which makes the structure also worse. Therefore you really have to compensate the end stage with longer levels imho.
I would suggest something like this:
Shortest levels (whether it's 7/8 or 9 mins) until either 250/500 or 300/600 is reached (so start level 16 or 17)
Mid levels (add one minute each) until bb 1500/3000 is reached (so start level 27)
Longest levels (add two minutes more) from 2000/4000 till the end
I also said this in the partypoker thread once, but the jump in structures from 1.5/3k to 2/4k is just too huge and I think it's a breaking point in the structure, therefore would suggest increasing the level time again at that point.
So you then basically would get either
7/8/10 minutes for smallest bigs
8/9/11 minutes for midstakes bigs
9/10/12 for highstakes bigs
I think this simple adjustment would already make a huge difference.