Poly Offset Upper Control Arm Bushings

That will make them into plain bearings/solid bushings...

But that will bind when the A-arm is moved up and down after you adjust the front and rear cam eccentrics in/out and up/down. If the inside holes are kept on the same axis, there will not be any binding. But that will only happen if the front and rear cam eccentrics are rotated exactly the same. And that will only allow caster adjustment.

im going tube and getting the benefit of caster... firm feel for the uppers the way to go?