If you are running Tren-Ace, use test prop, if you are running Tren-E run Test-E or Cyp. I would run prop EOD like you should. E and Cyp can usually be run at what you want per week. I am running 1000mg test, 400mg tren and 400mg of Mast right now. Maybe run 500 test E/Cyp and 200 tren - E to see how that does you. With Tren-E and Test - E/Cyp its going to be at least 2 weeks before you see or feel results. Tren Ace and Test prop work a lot faster but don't last near as long.
That's a good question and I don't know for certain but it would make sense that your thyroid slowing down considerably would cause a loss of appetite.
I'll have to do some research and check the correlation but I DO KNOW it lowers the TSH levels. Also, if you are going to run T3 at a high dose you should also be taking T4 but that's for another discussion.