As you know apples can tolerate (and even require) a lot of pruning to be productive. On trees like yours which have gotten too big, they often cut off the main leader/trunk to make the form lower and to open the lower branches up to more sunlight. Cut out any lower branches that have grown across others. Even after that you'll probably want to prune some more, but you don't need to reform the entire tree in one year. Yes I'd remove the upper leader and any lower cross branches and then I'd look at it for a week before considering more. I'm not a fan of pruning sprays (those tarry coverings) but I would cut the trunk at a 45 degree bevel and spray it.

I've no experience with those insect attracting balls,but that are used commercial to test when the moths are present to know when to spray. The pheremone traps might be better - don't know. I use permenthrin type sprays which are IMO among the safest and very effective. I've read tha ta kaolin clay dusting on the fruits is effective too.