Bilstein 6112 Settings and Bumpstop Extensions

My truck has a winch and aftermarket bumper that cause the front to sag about 1.25" from stock on the driver's side, and .75 on the passenger side (measurement from center of wheel to fender is 20.75" on left and 21.25" on right). Planning on Bilstein 6112 with 2 Boss 4x4 shims on left, and 1 on right, with 6112s on top (2.5") setting. Accounting for the sag I have now, that should put me at about 2-2.25" on both sides. I'm wondering what everyone has for bumpstop extensions with the 6112s. I was just reading another post on here about this setting, and the bumpstop extensions looked huge. I've done a ton of homework on this and haven't found good intel on the bump extension size.

FWIW, I'm planning on doing superbumps at the same time...

6112 specific experience is sought.

 

My question is why does it need the extensions. The shock should be the same compressed length as stock. If it isn’t, then it is binding the coil from over-preloading it and thus needs extensions, or the shock is too long for our trucks and thus needs extensions. Either situation to me is unacceptable.

The a arms have a fixed swinging arc. Just lifting with a spring/shock does not affect that arc

 

Assuming the shock is the same length, my assumption is that it is physically positioned at a different point in the a-arm travel...so that the A-arms are at a lower point (lifting the truck) when sitting still. That would mean that the shock would bottom out before the bump stops were engaged, on compression.

Anyone have actual experience with this issue?

 

6112's come with 2 thick washers to be used as a spacer for factory bumpstops, 1 per side only.