BOBFI,
About positioning the horizontal tail................
There is a fairly simple formula used by designers that give them a tool for sizing and positioning the horizontal tail fore-and-aft. There are other formulas that aren't so simple that're used for sizing and positioning the vertical tail fore-and-aft. Positioning the horizontal tail up-and-down is black magic and nobody who knows how that is done is sworn to kill whomever they share that information with.

The best way to approach the problem is to get yourself a good book and read up on this mess. An excellent one that will cover it all and do it in a way the reader has a hope of understanding is BASICS OF R/C MODEL AIRCRAFT DESIGN by Andy Lennon. It really is excellent.

In fact, aerodynamics isn't sound bite simple. Lots of people think every problem has a oneliner solution, but they don't. That book will help you understand better what relates to what and how and why.