A double rep sell is a new one on me! haahahhaa Get creative. A lot of guys here (especially the old school crew) will be commenting just to help you out. Promising rep is usually not necessary.
I'd keep Trouba over Hagelin. I dont know if its worth keeping Mason, but there isn't a better option than him, so may as well keep him. Its good to have him and Bryz then you get guaranteed starts.
I'd be looking to upgrade Fleury somehow. He's on a good, team, but he's had limited fantasy value the last couple seasons.
It also seems like you are carrying a lot of Dmen. 4 slots and you have 8. I might keep Matthias instead of Fraser. He has progressed this year and there is some upside there. He could surprise folks next year. FLA has a lot of young talent. If he were to ride some coat tails, he could do quite well as he has skills himself.
Dont drop Toffoli.... he got some good upside.
Now that I have looked at your roster a little bit, I think you have too many goalies. Even if one gets hurt, you still have 5 for 2 spots. None of the guys you have are prospects either. What would a Fleury+Ward combo get you? Might be worth thinking about if goalies have inflated value in your league. Parlaying those two into a genuine stud would be a good move.