I answered all of this about three posts ago.
You have too many trees. You need to get back to the basics. Sop trying to be an expert out of the gate trying to tailor specialized approaches for all of these.
They are ALL in recovery now.
NONE are prepared to develop quickly and won't be for the foreseeable future.
Balanced fertilizer FOR ALL. Get them all up off the ground.
Stop procrastinating. and most of all Stop, stop, STOP futzing around with them every day.
LEAVE THEM ALONE. look up "benign neglect" and take the definition to heart.