The "weak tail" or "tail wiggle" that the Tiger 60 is know for.....is actually NOT caused by the the stab or fin surfaces.

The actual cause is the lightening hole in the BOTTOM of the fuselage, imediately in front of the tail ( the reamost lightening hole in the fuse bottom)

The fin and stab are actually quite strong, and up to the task....but the last lightening hole in the fuse bottom allows the bottom rear of the fuse to "rack" back and forth. ( in Engineering terms, it is an "untrussed parralellogram" )

2 popular methods to permanently fix the problem....

1. ( for unbuilt Tiger 60 kits ) For people who are just now building their fuselage......DO NOT "PUNCH OUT" THE LAST LIGHTENING HOLE IN THE FUSE BOTTOM....Instead, permanently glue-in the "wood saver" piece by running a bead of thick CA all around the laser cut line.....and just leave it ( the wood saver ) in place.....Presto no "tail wiggle"

2. Tiger 60's that are already built from kits or ARFs......Remove the monokote covering from the last lightening hole in the fuse bottom......WITH THE GRAIN GOING SIDEWAYS, ( 90 degrees to the fuselage ), cut a piece of 3/32" or 1/8" balsa to overlap ( bigger by 1/8" to 1/4" all around ) the entire INSIDE shape of the lightening hole. Glue the "crossgrain" "hole filler" INSIDE the fuse bottom...completely covering up the lightening hole from the INSIDE...run a bead of CA ALL AROUND the joint....Recover the area with monokote....Presto...no more "tail wiggle"

Try it....you will be amazed at the difference in the stiffness of the rear fuse.

Good luck.