None first hand.

If your airframe is like mine, it's tail heavy tendency will be well compensated by a heavier engine. When balancing a nose heavy plane, getting the weight as far forward is tough (adding balancing weight further from the cg increases the moment, decreasing the amount of weight required). To me, weight and wing loading is everything. I would buy the airframe, completely assemble everything (radio, pushrods, etc.), then try to calculate the amount of weight required in the engine compartment to achieve balance. I've used broken paver peices placed in a sock for this. Install as much engine as you can with no additional weight for balance, and you should be very happy.

Good Luck!