You could get the engineers to check the idle isn't set too low, or leave a bit of power on as you go into the spin, or try spinning the other way.
Our idle is deliberately set very low (full idle actually is a very rough running engine at at little over 600 rpm) to make sure you can do a decent (competition-grade) spin entry.
And entering a spin with any power left on is a big no-no. I haven't tried it, but I've been told that it's far easier to enter into a flat spin that way, from which it's incredibly hard (or maybe impossible) to recover.
The R2160 POH only describes spins which are entered with the throttle closed, and where the throttle remains closed until after recovery. So anything else and you're a test pilot.