I've tanked up to turn 6 and honestly, I have never had TP problem. :/ My static Warrior never calls for Paeon neither, well he never runs turn 8 as warrior so who knows. It's probably the only fight I run out of TP as monk anyway. Main tank has Brainjack to somewhat regains their TP.
Also, you don't need to keep using overpower unless it's a speed run, even then you have Steel Cyclone while Overpower has a massive aggro multiplier that noone can take aggro from you after maybe 4 of those (careful with non-quelling strike Flaring BLM but that's their faults, not yours). If it's like 3 or 4 mobs, just rotate your Butcher's Block combo on the mobs according to how the DPS are focusing. It's not hard, just take a bit of practice and you should have started doing so around level 30 when you get Butcher's Block.