Full stacks, Hero is UTG and has behind 5 loose passive players, let's say 25/8 or 30/10 players. What are you opening and how do you make it?

I thought about it when I was on this type of table and I got dealt 99 and TT UTG, well above average hands but that don't play well in MW pots unless they flop a set. Since basically we are pretty sure we will end up at the flop with 3+ players, I think is better to minraise and play from there instead make it larger and got called in multiple spots, but I don't know, I think this is a leak since we are wasting a ton on value considering Villains' ranges. 

If 2x is equal at 3x, from the Villain perspective, what size do you choose? Are you making a bigger raise size in this spot?