Models of this sort are EXTREMELY sensitive to crosswinds on both takeoff and landing. The narrow gear, high center of drag and smallish fin and rudder area all conspire to produce many a quirk if there's more than a few degrees angle to the wind.

If you have no option but to take off in cross wind conditions then you'll need to get very practiced on the use of the rudder.

In the air is different. Sounds like you're just fighting with a few trim or possible warp or misalignment issues between the panels. If you can't figure out accurate ways to test all this then get an incidence gauge and check the wings in a wide number of positions looking for angle differences of more than 0.5 degrees.