Can you press LCA PST pivots shafts in too far?

if you rotate the control arm up so it's closer to what it would be at ride height, i think you can slide the pivot further into the k-member...

Also true, in addition to overpressing the LCA pivots. The stock LCA's will hit the K frame if they're allowed to hang down like they are in the picture. Lift up on the LCA and it will slide all the way in.

Couple of thick fender washers.......

Huh? If your plan is to put those on the pivots to take up the space, that is a HORRIBLE idea.