This is the HU Cash forum, not the Husng forum. That said, as a husng reg, I can still help you out.
1) Yes, lobbies $30+ are pretty much controlled by cartels. Yes, everyone still uses sharky.
2) 5% in fish games is quite solid.
3) Hypers are 25bb effective, not 50. Q8o should never fold the button in a hyper regardless of depth. Assuming you're talking about 25bb stacks, the button should be playing hands as weak as T2o and 83o preflop, and the bb should be playing hands like J4o and T5o or T6o vs. button raise.
If you're not (as a default strat) playing at least 90% from the button and 60% from the bb 25bb deep, you're doing something very wrong.
Hope this helps. Also, I coach if you're looking for a cheap hyper coach