Yep, summer in Michigan, you really don’t need to be feeding the bees syrup.
2 deeps of bees is more than enough to survive our winters. By fall they’ll start backfilling the brood nest (top deep) with nectar. Not something to worry about now. Right now, you want maximum # of bees. More bees = more comb building = more foraging = more honey. If you wanted to pull out a few frames and start a nuc now, you could.