One observation. Trainers have very weak and bendy gear - to absorb abuse. After a few splats the main gear is splayed out, the nose, with the spring & generally stiffer wire, less so. This gives the wing positive incedence when the wheels are touching. Enough so, quite often, that the plane has a tendency to want to lift off again. Take the time to set the plane on a table and make sure the wing has a bit of negative incedence, or the flat bottom of the wing is at least parallel with the table.

In the past I have rigged 12# pike leaders or weed trimmer line across my wire gear to stiffen them up.