You’d be better buying some 12.9” Shocks
if your dead set on lowering the back end. The standard is 13.4”, it doesn’t seem like a lot but it will make one heck of a difference. I think you’ll find a full inch quite harmful to the bikes geometry (and watery to the eyes too
If your lowing the back then you’ll want to lower the front by a similar amount (although any adjustment will change the bikes handling even if you do both)
Lower profile tyres will change things also.
The question back at you is why do you want to lower it?