Over a course of 1 min you'd be doing 40 attacks.
In the same time with same rage I'd be doing 6x Raging blows and HS the rest of my rage which is in te neighbourhood of 36x HS.
My raging blow is only hitting for about 1k less then HS. So overall dmg by you is 480k and mine would be 432+66=498.
Each time you hit Raging Blow your hitting with both weapons, so even if your log says it's only hitting for 5.5k on average, each time you hit the button your making 2 attacks for 7.5k mainhand, 3.5k offhand (guessed ratio but you get what I mean). Totalled to 11k hit on averrage for pressing a 20rage Raging blow, HS gives 12k on average but for 30 rage.
In fights where rage isn't an issue, you'd be able to keep up BT-RB-BT-filler anyways with spamming HS so that doesn't really matter, it only matters when rage is low.