Don't be afraid to use you intuition and cut things back if you feel its correct. Cant stress that first point enough because a single image I see via nostr is not the real thing and there is way more information looking at something in real life.

If I were doing it the bottom branches look good. Is it possible to bend those branches 3rd up from the top down on to the second wire if the crotch angle allows it (aka do you think it might break in the process)? If so perhaps cutting out the second up branches and having these instead might be a good idea.

Also once you have reached the top of your wire cut the main leader (aka main branch) sort of level with the  top wire you want it to grow to. Once you do this the overall growth will start to become more parallel with the wires.

If Arkansas black is a very vigourous variety it might be worth pruning it back a bit initially along the wires too. Not sure myself... don't even know if we have it here in the U.K, every apple variety can have its quirks. For example you will need to check its a spur bearing variety as pure tip bearing varieties like Irish peach a very early apple are no good for espalier production.