This pertains to my DR650 dual sport but it is a general question.
I'm a tall brute and decided to throw on some raising links (shorter dogbones) and it lifted the rear at least 1-2 inches. The rear suspension now seems really form (almost too firm). For context, I still have stock shocks/front springs and they are notoriously soft on this bike. I'm still wrapping my head around rebound vs. compression damping etc etc -- what are the mechanics behind raising the rear of a bike and why that would make the rear shock feel firm?
I don't know anything about DRs but your post is describing a linked suspension, and that you have changed the length of a link component.
Such length changes will change the leverage, which affects the forces the spring and damper see.
It also affects the ride height, for any given shock length X spring x installed spring height x installed preload.
Depending on which length has been changed, and whether it's been made longer or shorter, the affects can be in either direction.
To put it in perspective, look at it this way.
In conceptual terms, a typical linked swingarm needs about half as much spring rate as an unlinked swingarm, and the damper will need to provide far less hydraulic damping forces.
You might be able to find a XL based calculator somewhere on the web, and play with the inputs to give you some good insight as to what you are observing, and how to change things in a direction you want.
Hopefully the above is of some help.