Thinning honeycrisp apples
For your young trees you don't want to over-thin because the fruit size of that particular variety will be too big for the tree. Probably no singles, you would probably want doubles. Big clusters of Honeycrisp won't ripen well and increase likelihood of bitterpit. Around 2-4 fruit per linear foot of fruiting wood is a reasonable number, less if the fruiting wood is small caliper. It might take a few seasons to find the right balance.