Even with speed, you'd be surprised what a Ki-43 might catch. Sure, my wings are crying, my tail is trying to come apart, and I can't pull more than maybe 3Gs, but at 380mph in a dive I can catch some folks really off guard. Roll up and over, with my rudder sticking out like a dive break and my throttle closed. It throws off speed like crazy. Then I'm latched onto the guy who assumed the fast Ki-43 wouldn't be able to turn.
Of course, then
I'M out of E, and it becomes Do or Die. Though, she climbs so well that I can often get it back at low alt given just a minute or so of peace. With WEP I'm hitting nearly 3,800ft(ish)/Min. At least for a little bit.
I wish I knew the time limit, and recharge time for the Ki-43s WEP, it helps it a lot at low level.
Anyway,
See ya' in the not so friendly skies.