My suggestion is this, ask questions but don't make demands. Odds are strongly in favor of an experienced engineer knowing what they're doing. Maybe he's doing Left/Center/Right. Maybe he's using one as a room mic'. My point being, ask him why he's using three overheads don't just assume he doesn't know what he's doing.
Practice spot, room, where ever they are they aren't in the studio and the studio will have different acoustics. If it's a big room it's going to be really "live" with a lot of natural (and tuned) reverberation but a small room will be really "dry" with little to no reverberation. What sounds great in your practice spot might sound flat in the studio and vice versa. It shouldn't take too long to fine tune your drums to the room, just get there a little early.
"If the goal is for me to give up my reality for your reality, then the goal is for me to give up my self for your self--a goal I have to reject."