Depending on how long the SP debuff lasts, it seems like SP will be the go to secondary combo while tanking and the SE combo will be the go to while off tanking to add in some extra DPS. If I'm main tanking, I'm honestly not worried about my own DPS. It's nice, but staying alive and maintaining aggro is what I'm concerned about. It's normally easy to do that on bosses without ever using SE at all.

So, while MTing, depending on the duration of Storm's Path... BB, BB, SP, BB, SP, BB, Etc. While off tanking, SE, SP (to help the MT), BB, SE, BB, SE, etc (unless you need to throw in another SP to help the MT).