Cut 'em off!
Hey Mike! I built mine with the tips, then cut them off after a few flights. It makes it a totally different plane! Faster rolls and minimal rocking in harrier.
I'm running a YS 63 on the stock wood mounts with no trouble after about 25 flights. I used 2 oz glass cloth & epoxy between the mounting beam layers, and I used strips of glass cloth to help hold it to the firewall.
I sheeted the stock stab with 1/16" balsa and built new elevators out of 3/8" balsa. I also made taller gear out of 5/32" music wire. All else is stock.
I'm running a DuBro 10 oz tank. All up weight is just under 5 pounds with HS 225 BBs on elevators, 225MGs on ailerons, HS81 on throttle, and an HS77 on the rudder.
Best plane I've had!
Chuck