[Perestroika]

I think hand one is more interesting so I will comment. I think any size bet unless your opponent consistently is making huge overbets is really a sub-optimal play given his most likely range. Therefore checking seems to be the best option, and I think CHECK/RAISE dominates all other options from the alternative CHECK/FOLD or CHECK/CALL. I actually think CHECK/CALL is also not good, but of course will win you money I would imagine around 20% of the time. If opponent has a 6 65% of the time and he even folds it 75% of the time to your river C/R you are gaining EV, otherwise if he is a massive fish and will call it then wait for a better spot and C/F.