When the Scandinavian Historic Flight used to operate a T-28 on the European circuit, one of the UK pilots (Mark Hanna?) displayed it regularly and I recall spoke about it one of the mags; I’m sure he praised its aerobatic qualities but made a point about its ability to pick up speed rapidly when heading downhill and had to be treated with respect.

Seems to something of an absence of speed at the top of the loop, I’m wondering if the right roll was torque induced during a stall. The video at an earlier event in post 3 seems to show him rolling left off the top with very little height loss.