Front trx450 shock settings

Need a little help. did the front trx450 shock upgrade and rear ltz shock upgrade. i’ve ridden my 800 a couple of times since. i removed both front and rear sways. i have a 2" front lift. it rides good over terrain but if theres a dip or a rut something the front takes a huge hit. almost like a slam. im assuming thats bottoming out?
last weeked i hit a groove or whatever you want to call it across the trail and it slammed again in the front..the roof of my rzr popped off and slid across my hood…there goes my light bar and antennae wiring..easy fix though.
whats happening here?my buddy said his stock 800 shocks didnt bottom out one time and i was following him. my stance is even taller.
there are two adjustments flathead screws. one on top and one on bottom. could the shocks just be old and worn out? HELP!