I have just about the save size tank with YWG, pair of clowns, diamond goby, cardinal fish and lawnmower blenny and I feed about a third of that.
I used to over feed. Fought algae and high nutrients. I kept cutting my feedings until I got where all the food will be ate in 2-3 minutes. Maybe faster. Now the fish are actually pursuing the food instead of just waiting for the juiciest price to float by them.
I feed the same as you.
PE mysis flat, about "half a cube worth" a day. I'll defrost and strain the food, then feed about 75% of what I strained and usually that's enough. The rest I'll spot feed corals after the feeding frenzy, put in a condiment cup for later or toss out. I feed rods food once a week to "feed the corals". When I was feeding rods food more often my nutrients shot up.
I think a lot has to do with filtration and the amount of corals.
Edit: just to clarify, I feed a half a cube or less each day.