1st QQ - I am sometimes getting the money in pre here vs unknown but will also be flatting sometimes. Assuming villain is competent he is not holding AA/KK/QQ/JJ when he checks here so bet flop for value/protection.

2nd QQ - You say you called pre with the intention of check raising flops. The problem with calling is you are likely to go to a flop out of position with as many as 5 players if the big blind & everyone else calls behind. 3bet pre is best. If UTG likes to limp/reraise alot then calling here is an option but I would not do this unless he was very likely to do it.