How can i increase my pull ups repetitions every time i train pull my pull ups increase explosively but not by repetition ive been stuck on 13-15 pull ups for a long time?

Does anyone know what may be the reason for me not being able to hold a tuck planche i struggle to keep my arms straight and my sholders feel like they’re gonna pop even tho i have very decent sholder strenght i can do 1-2 free handstand pushups

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