I think you're undervaluing Strome here, although it seems like the rest of your league is, as well. I have no problem with you moving Strome to focus more on a 3 year window, but if you move him I feel like it needs to be for something more than Hamonic who's a solid player but Strome is a top end prospect.
If Hamonic is the best offer you're getting for Strome atm, I would hold onto him and wait. Someone will give you a better deal eventually, and if they don't no biggie you keep a very good prospect on your roster for the time being. There will be a boost to his trade value next summer when it's determined he'll be skating with the Isles.
20 Team Dynasty (points per) - G (25, 50 for defense) A (25) PIM (3) +/- (5) PPG (15) SHG (25) OTG (15) GWG (25) HTr (50) GP (2) HIT (1) BLK (1) Use actual NHL salary
F: Malkin, Tavares, E. Kane, Parenteau, Havlat, Tarasenko, Galchenyuk, Brunner, Boyes, Kruger, Helm, M. Martin, Bergenheim, Carcillo, Stajan
D: Green, Ehrhoff, Ekman-Larsson, Coburn, Daley, Postma
G: Fleury, Mason, Montoya
Farm: Grigorenko, Grimaldi, Kucherov, D. Shore, Hartikainen, Stransky, Kerdiles, Joensuu, Pageau, Murphy, Ceci, Klefbom, Thrower, Donovan, Ekholm, Lehner, Dansk, Poulin, Nilsson, Andersen