My Flip 3D tends to "wag" a bit during forward flight. I have HiTec 605s on 6 volts with the stock rod and clevis'. I think it's the tail section being "loose" but how would I tighten it up? Should it do this?

Thanks,
Dan

Try going to 4-40 rods, especially on the rudder.

Yup, that's the fix.
440 rods and metal clevis's.
Same thing happened to my Giles 3D (full flying rudder, too). I went all the way up to a poor centering 100 oz servo before I went to 440.
Damm near bought a Digital servo...