Question of dual wield vs 2h maraud

Should I see a damage increase switching from dual wield to 2h in regards to skills like heavy strike and ground slam? As a lvl 45 dual wield marauder my dual strike does 1400, heavy does 800, and ground slam 600ish. Obviously I won't have ground slam anymore, but I feel like a 2h would push up heavy strike to that lvl and my ground slam up in the 1k range (assuming i get a similar quality 2h) since they just spam main hand damage.
Anyone have any insight on this?