Sorry I don't know much on this subject, but I was told that you need to take at least half of the apples off when ripe, to maintain a healthy growth for the next year.
I always do this for my bosses apple tree, and it does seem to improve every time.
Apologies that I can't help you further, I'm sure somebody else will add further info on for you though.
Best wishes, Diane.
I have never farmed apples, but you have an unbelievable amount of information at your finger tips. Try the web sites I found. They look very helpful.
https://www.gardenaction.co.uk/fruit_veg_di...er_2e_apple.asp
https://www.gardenaction.co.uk/fruit_veg_di...er_2f_apple.asp