Any problems using poly along with rubber bushings

Another thing to check when you have it apart- there are UCA eccentric bolts out there that don’t have the flat cut far enough down the bolt. With those eccentric bolts, even if they’re fully tightened, the UCA can still move around because the washers bottom out on the flats before they clamp the UCA mount. So if you have wandering alignment settings and you have replacement UCA eccentric bolts it’s another thing to check. More than likely it’s the LCA bushings being torn like you’ve already identified. But it wouldn’t hurt to check the K for cracks and look at the UCA bolts if they’re not OE.