Luxilon All Power Rough 1.25

One of the older polys, used by loads of the pros.  You really need to be hitting the ball hard and bending the strings to get the benefit; the harder you hit, the heavier the ball and the more the ball drops in.  If you don’t hit the ball too hard, probably don’t bother because it’s as harsh as fence wire.  Definitely hybrid this stuff with something softer, unless self-harming your arm is your thing.