The back controls The elbows! The back must become stronger!
More reps dipping means your back must stay tight, to keep your upper arms in position, longer.
Pull downs, keeping your chest up. Rows. Fat Man Chinups. Reverse Pec Deck.
Maybe some of these.
Fire up the little muscles in the middle of your back, feel the squeeze back there. Think about the “reverse motion,” or lowering during in a dip, when you are working your back.