I second the melting issue. Go with hard shell chocolate.
Also try mixing up a batch and keeping it in a warm place for a couple weeks. (I would say your car dashboard but I note you're in Minnesota). My trail mix last summer had yummy cashew clusters in it. Unfortunately they seemed to absorb moisture from the other ingredients in storage and became very, very stale and nasty tasting. So give it a shelf-life test.
In the future I'll keep fruits, nuts, and chocolate separate.
Regarding the quantity- it's really your call. I hiked the JMT last summer and did more miles than my prior experience so figured I would need a lot more calories. I packed 3500 per day which turned out to be way, way too much. For a future two week trip I'll probably do 2500 per day the first week and maybe 3000 after that. I lost about 10 pounds over two weeks- if you don't have extra fat to spare you may need to carry more food in the pack. I'm guessing your mix is close to 150 calories per ounce (or 5 cal/gram)
I have learned in the past, and relearned on this trip, that I don't do well at digesting dietary fat while hiking above 10,000 feet. They make me feel very tired. I presume it's because of the oxygen required to burn fat. Typically my fats mostly come from the nuts in trail mix. For future trips I'll try to consume more fat at dinner, less at breakfast and lunch.