FYI,
I finally put in a new tray per Mark's suggestion.
I had severe flutter on the elevator last year (when I bought it).
After opening up the bottom, I found a JR 507 moving both elevators with 1/8" plastic guide rods (I'm lucky I didn't lose her).

pic 1:
The new servo tray.
Six screws holding the tray in to triangle hardwood epoxied to the fuse (screws used in case I need to remove the tray: not too much room to work in there!).
I used two 133 oz servos for the elevators (that should do it!).
The rods are carbon fiber with 4/40 rod on each end.
The two new servos are on each side and I moved the rudder/tail wheel servo to the center.