Moving the CG back will help.. I just added stick on weights 1/4oz
at a time untill it got harder to land on my Avistar.. I then added
a little more till I had to fly it to land.. They do get touchy so go
slow if you choose this option.. If your good at wood work you
could take out your wings dihedral.. But that may be going to far
as with other mods for a trainer.. It may be best to just move up
to a better model.. There's a few options that will make it fly some
what better.. But trainers can really only go so far... Best to leave
as is and move up.. Save the trainer to maybe teach a family
member or friends...