The P&W engines in the T-6 are having all kinds of problems with acrobatic flight. Great engine for a King Air, not so good for acrobatics. I flew the Bronco with the Garret (now Honeywell) engines and they were great. Hope the new bronco rides with the Honeywell engine used on the Reaper.
PT-6's on the T-34 did just fine with acro. Can't see the problem in the T-6.