coming from someone who has been slacking and not training as much as i should i can promise you its about progression.
ive taken months off with inconsistent training in strength and technique, i recently went out again after a few sessions with nothing more than a few pop vaults here and there. i went "the hell with it" and decided to start jamming at a wall i have never come close to getting to the top of.
guess what happened? i didnt get to the top but, my fingers were cleanly wrapped around the edge. dont ask me how, i just had long powerful strides that i measured out and just let my body do what it needed to do. you will eventually get it, maybe just think a little more about visualizing. its not exactly an easy technique.