RE: CMP 160 sized Texan
Patzane and gridgod,
you might try increasing the size of the rx pack and move it as far forward the CG as possible.
Also if you are using a push rod for the rudd you might switch to a pull- pull wire system.
If you have to add wieght try adding a wieghted prop nut such as a Higgly Heavy hub.
If you are using one of the new electonic ignition gas motors you could increase the battery there too.
Also look at the wheels- can you use a lighter or heavier- but still scale looking wheel (like a plastic from Robart). Don't forget the tail wheel too!
I hope these ideas help and good luck!
SR/CP