Piper Cherokee 6 PA-32 running at Lean Of Peak (LOP)

Running my Cherokee 6 at LOP at ~7500 feet. I was doing laminar flow testing on the wing, so wanted to get near best climb speed (110-115mph). Dirty oil was run along the front of the wing, and where it pooled where areas of detachment. Specs as follows: 1970 PA32-260, over FWA Turbo not engaged MP 19 inches (throttle plate pulled back about 1/2" to mix air better) RPM 2300 Fuel flow: ~9.9 gal/hr EGT diffs 35-40F Indicated airspeed: 115mph OAT: 15C True airspeed: ~131mph