All savage bosses are 100% dps focused encounters. You need to spend zero time in tank stance for any of them (except A4S if you are tanking the laser in the final phase, which is less than 30 seconds of the 13 minute long fight).
So...? I dunno, it seems like what you are saying you want already exist, the content simply isn't tuned correctly to require tank stance so of course tank dps appears to be incredibly high?
Edit: I think I basically agree with you? But I don't think tank numbers need to be changed. Content needs to be tuned properly so that tanks are forced to use their stances that reduce their dps ability, not just have their overall output cut (since, as mentioned, it makes soloing very frustrating).