I'm in the final stages of the build on this. I have to say its been a bit of a struggle and needed a fair amount of "engineering" to get the tank in, the right distance from the front of the motor to the firewall, the wing in place, and a few other things. Actually a bit disappointed in the amount of tweaking this kit needed. Anyway, I am absolutely getting freaked out about engine size. I have a OS FX61 currently in the plane and to me the plane just looks absolutely huge and weighs a ton. I'm wondering if a .61 is big enough. I have seen some posts indicating a .61 works. And then a few talking about only slightly larger engines, and then some that are probably way too much engine for this plane.

Two questions:
1. I've got a FS91 not doing anything. Would I be better off putting that in the Stuka and saving the 61 for some other project?
2. Has anyone else and any problem with balancing this plane? It balances at about 3" from LE and it should be 4. This means I have to add a ton of weight to the tail. Most other posts I have seen indicated this plane was tail heavy. So this has got me wondering if I've done something seriously wrong. Any one have comments on the weight?