Tom has a set of the 3700's and will be trying them shortly in Masters. Although he sold his Pletty's for Axi's for more power, so not really a equal comparison. As the Axi supposedly draws more amps. But if they work for the Axi, they will certainly work, I would think, for the Pletty's.
I will probably try the evo's soon also. Although I need the nose weight of the 5300's.
Gotta love a Yak Mike. Great aircraft... Hope you get it done soon..
Chris