I usually run a super tacky hr 2.35 on the rear and a 2.5 front dual ply for uplift days.

Considering running 2.5 on the back too. Any reason why I should stick with a smaller rear apart from drag?

Clearance. Squirming if the rim isn’t wide enough. Easier drifting to tighten your line if the back has less grip than the front.

Clearance isn’t an issue, nor rim width – flow mk3

Noted re grip though through corners!