Ok, flight today at FL260 after a few engine adjustments. They cleaned the P3 air filter which was partially blocked and turned up max power a couple of turns. That fixed the problem completely. Knobs matched again and plenty of throttle left after reaching max temp. Engines matched perfectly in HP, EGT, and fuel burn. Flight to BTR was about 1.4 hours so plenty of time at altitude to test out. Couldn’t be happier with results.