dbow,
there is no way in the hell your razor is going to be 4 1/2 lb. my seduction freestyle weighs 4 1/4 lb, but it was a kit and i built it very light and used epoxy only on the firewall, wing joint, wing mounts, and landing gear plate.

if you stick the horizontal stab in the hole and shim it on 4 corners then that is all you need to do. remember IT IS IN A HOLE!!!!!!! if something is supported on 4 sides then were the hell is it going to go, you could glue it with spit and paper.

the seduction freestyle/razor is very strong without any modification. i did a header into the ground at high speeds when i had an aileron fail on me and the only thing that broke was the fuse right behind the wing. i could have fixed it but it would have been heavy, like yours, so i bought another one and it is beautiful in every way.

Your plane is going to come in at well over 5 lb and you have completely destroyed the flight characteristics of the bird. it will no longer be any good at 3d flying. and when you reprt that the plane wont perform well at 3d at complain about that as well you need to remember that you are the one that screwed it up. congrats!!!!!!