20, 21 and 22 props with 8-10 pitch is common on these engines.
7000-8000rpm is typical with these prop loads.

I can't offer info on the smaller NX props but the larger ones seem to flex more than I like, kinda reminds me of a Zinger in this regard. Menz S, Bambula, Mejzlik work well, IMO.

I like a 21x8 Menz S it seems to perform best for me.

I have even ran a MENZ 19x10 3 blade and that worked well.

I'm running a Menz 22 x 10 Std on my T-52, around 71-7200...and it doesn't flex or un-twist.

Probably would be perfect on the BME.

I tried menz ultra 22x10, Menz S 22x8 & 10, and settled on a Moki 22x10, which I thought worked best for me for both imac and 3d. 7300rpm with the moki 22x10.

When I had a Moki, it was a really effective prop for IMAC or Freestyle...lots of good choices.