first trouble, the stabilizer ribs rear end is not at 90 deg. so they almost dont make contact with TE. while flat on building board
Any suggestions?

Photos? If it aint right, dont glue it.

Got it!, I overlooked the step3b to sand flush the TE with aileron stock used as elevator, doing so will give you an angled side, used as the bottom side of trailing edge will give you the right angle for the ribs to match, will post photos, thank you please be around I dont have much building experience but enjoy the brain teasing of this side of the hobby