I don't think that SARMs can replace testosterone but you can use LGD and have good results. 12 weeks at 10 to 30 mg a day is perfect. Run some GW with it.
Deca definitely will increase your appetite. That's one of the ways it works, but you have to be eating a solid diet as well. You can't just take it and expect miracles.
I think you're going to do great on this log. @Darts55 you have an excellent base to work with, and you've really done well to get yourself into this situation.