ALL of the " snapping problems " I have seen on these designs --is caused by one thing.
The durn model is just too friggn heavy.
Snappin Caps -originated with the first GP Caps from years back -- they were also WAAY too heavy.
Caps setup at 25% of chord balance- with reasonable wing loadings are super flyers.
I have built kits in various sizes as well as designed them from .40 cu in engine size to 150 cc size
The full scale Cap has had long and short wing setups (Cap 21 -- CAP 232)- all will snap if heavily loaded.
the scale stab setups are both forward and relatively small.
Anyway - the majority of the BARFS I have seen --are overweight -and all of the hinge line sealing etc ., will not solve that problem.
Speed and careful control inputs will keep the abrupt snap from starting --