Help with first Haat Solo

In P2 and any tank phase, you want to hit the tank as many times as you can between topples too. Ideally toppling it right before it takes a turn. If you constantly topple it right away when it's back up again you're losing out of plenty of damage to the tank itself while it's up. I.e. fracture it when it comes out of topple, kill all but one turret, hit the tank until just before it takes a turn then kill the last turret. Those 4+ hits on the tank out of topple really do add up over the whole phase. If it's getting to enrage when you're in the last 5-10% this might get you over the hump.