I did take your team into account. My issue is that even if you expect a big season out of Martin, you’re still vastly overpaying by giving up Fitzgerald in the process. If you asked me who I’d want as my flex between Martin, CJA, Woodhead, and Fitz I’d choose Fitz every time and it wouldn’t even be close. Especially in a half PPR league.
If you want Martin and are down on CJA, then give up CJA and Diggs. If you’re willing to give up CJA and Fitz for an upgrade at RB, it should be a RB that’s much, much better than Doug Martin and that’s going to be playing for the first three weeks. If McCaffrey, Cook, Gurley, Fournette, Crowell, or Miller isn’t part of that trade then you’re being taken for a ride. I’d even go as far as to say Zeke given he’s going to miss the first 7 weeks.
Your team is very good, and you’re probably in a position where you can cut deals where you give up more than you’re receiving. However, I do not think you need to be giving up the best player involved in the trade in this instance because you’re looking to upgrade your starting lineup, not your depth. You don’t accomplish that by trading away Fitz.