If you can handle 45 in 5mil you’re a better man then me.
Generally speaking quarries warm quite a bit as the season goes on.
Last August we were able to dive our local quarry (Dutch Springs) in 1/2 mil
suits as long as we keep it to 35’.
Most people dive dry or 7 mil wet. Buoyancy is tough with 7 mil until you get used to it.
i would stay with the 5 mil if you find it warm enough