Ok what u can try is to lower the dwell to drop fps. So if u are chrono at 270 and dwell is at 15ms drop dwell to 13 and see if you can reach desired fps.
Closing the noid sooner will allow you to decrease your fps and still keep the recharge rate open.
Kind of weird to not be able to chrony lower in the cold. Usualy it's the opposite. Especially with reballs which almost always chrony lower due to their higher weight.
CCI stock class Phantom pump f/s. This thing is LNIB. Comes with stock magazine, extended magazine, barrel detent kit, crossfire lite up dot sight, velocity adjustment tool, 12 tubes even the barrel blocker
Ninja grey 50/4500 paintball tank f/s. Hydro good until 2019
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S