2017 GT PP rear end shifting under acceleration

[slvrsvt01]

Hey everyone, bought a 17' GT PP Nov 2025 62k miles. Mods CAI, axle back, BMR level 2 lock out, and diff bushings. I've noticed 2 things since owning it. First is only after car warms up from a dead stop I start off slow I get a rear clunk/pop. You can actually feel the car move with it like a left to right motion. Small but feel it in the seat. If I push the clutch in or get above say 5-10mph it stops and is very smooth. Second when I go WOT feels like the front of the car pulls left, I would compare to a drag car twisting the chassis. Not to quote Dom lol. Other day did a pull and felt the front end move to the left and around 85mph I hear the rearend pop (like at low speed) and literally felt like the car actually centered up. I have looked for months and the only things I have come up with is do the lockout kit and diff bushings. I have torqued axle nuts and checked most bolts and nuts that i could get to for toque and everything seems to be tight as it should. Other things I haven't done are thrust washer on axles or LCA bushings or vertical links. Seems those are common pieces that others replace. Any thoughts are appreciated. Thanks!