"Taught" about this quirk during endorsement training, but never been able to reproduce it operationally. I was led to believe that it was affected by the rigging, and substantially reduced/eliminated with the B2 upgrade, which revised the rigging and pitch horns. As such, I would expect that the 145 should limit the problem, but that's only a guess.
I have had instances of pitch "running away" nose up at altitude, when IAS has got on the high side, which has either needed gobs full of forward cyclic or a pedal turn/roll to reduce. Talking about DA>6000ft, though. It can be a bit twitchy up around 9-10,000 ft, but the collective is usually around the pitch limit there, anyway, so most flying is with the trim rather than brute force
(Just a late thought, but reducing collective is sometimes a solution to the pitching up problem, but not always. But it helps at high DA)