Not a manufacturer error !!!!
All their kits are "optimized" for JR servo's, Correct me if I'm wrong!
If you really want to loose your time, take your biggest pencil and try to convince Carf to change that !

Or just buy equivalent JR servo and stop to complain

I had the same little prob., just 30 min to adjust and glue a little plywood behind !
No worries
Personnaly, I also changed the rudder servo tray to have receiver and powerbox inter on the same plate.

Wheels : simply a diam. 4 mm hex screw through everything, some nylons washers, nylon-bolts see pictures. Almost what's written in the manual.

Tailwheel : some 3 mm plywood, PU glue, 2 insert coil MPjet "et zou....."

Enjoy the great airplane you have for the money you paid
I didn't try to save any weight

Laurent