If it was me, I'd have the auto feeder just feed once every other day while you're gone. No need for frozen at all during this time unless any of your fishes don't eat pellets. In that case, I'd have someone come in 2-3x a week to feed frozen. You're fish can go a stretch without eating every day.
I personally feel your normal feeding level is just fine. Just keep an eye on nutrients and if they start getting elevated, then perhaps adjust your feedings accordingly. When I feed my tank, it's like a snow storm! I have an autofeeder feed 3x a day and I also feed frozen in the evenings. I also have a ton more water volume and a giant skimmer so each system is going to be different. What is the same is to monitor your nutrient levels in your system and feed accordingly (or utilize other ways of nutrient removal). I'm of the camp... feed heavy, export heavy.