I stick with vx -II , vx-iii, vari x , vx2, vx3 , etc.... im basically staying pre vxi and all the offshoots.
I have Vari-X's from the 80's and 90's that don't track all that well either.
I have a VX-II 2-7 that tracks diagonally--and I have remounted the scope more than once to check if it was my fault.
But I don't have problems with holding a zero with my Leups.......