sorry about the small samples but just trying to do a bit of maths on this


so first off RB hits for 5.2*2 = 10.4
HS:
dps = 12800/1.5 = 8533
dpr = 12800/30 = 427
damage/6sec period = 25600
BT:
dps = 8800/1.5 = 5867
dpr = 8800/20 = 440
damage/6secs = 17600
RB:
dps = 10400/1.5 = 6933
dpr = 10400/20 = 520
damage/6sec = 10400
so HS is not on the GCD so you can use it anytime you want. that means the only consideration for any sort of priority when talking about HS is rage and its the lowest dpr technique out of the three.
RB hits hard than BT but its on a 6 second CD. During a comparable 6 second period BT actually accounts for more damage. basically if you delay BT you also delay all the follow BT's the same as if you delay RB you also delay the following RB's.
So although RB hits harder than BT in a 1.5sec duration (direct comparison of hits). BT actually is a large amount of damage over 6 sec duration (which is mandatory for RB as that is the CD).
Based on this I would argue HS should not be the top priority, it should come behind BT and RB. For people who can't maintain rage this will yield more dps. For people who can this wont make a difference because they'll have it on CD always anyway reguardless if its 1st or 3rd prio.
I also think BT should come before RB due to not wanting to delay the bigger damage per rotation.
I would say:
RB > BT
If you can maintain those on CD then BT > RB and as much excess rage as possible into HS.
If you can maintain HS on CD then extra rage into slam.
(other stuff may take prio depending on the raid setup. like sunder or demo shout as well i guess)