If anything, I'd leave the shocks and the 3" bumstop out of the equation, then bumpstop like an inch (hockey puck) or whatever you need to keep the bigger tires from rubbing, assuming you are going to step up in tire size.
The 3" bump will work for the 2.5 shocks but you are going to be reducing up travel a LOT for a 1.75" lift. Stock shocks are fine at that level. The 2.5" shocks are probably made to go with springs that lift the vehicle close to 3" or so.
I run 3" of bumpstop, but that's because I am on 37's, sit at 3.5" of lift, and have a drag link flip.
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