Aha

It sounds strange that the solid ones would give a to high rear cab?? Maybe the rubber bushings seats and that's why the DC was lower than yours???

It would be nice to know if the cab is leveled front to back somewhere when the frame is leveled, or something similar???

 

I've been having same issues today and done exactly the same,set my adjustable ones the same as originals and was all over the place. ended up putting two bits of 2x4 on chassis under rear of cab, unbolt front measure up all four cab corners off chassis, back of cab off bed.
Does anybody know Should cab be level back to front and side to side??

 

try this.
leave the fronts bolted in place,
unbolt the "lower" adjustable mounts,
put a floor jack in the rear floor of the cab and raise or lower the cab from the frame top to the body seam below the rear window.
then rebolt the lowers back in place.
it helps if the bed is on so you can adjust the rear slats on the back wall to top of the bed,

 

What condition is the front mount rubber?

 

my entire front mounts are new....
i could not tell any difference in the adjustment in the front mounts.

 

here is a before pix and after pix.