If you want an OE solution, IIRC an earlier Ss was 1" lower than a later one*. What I usually do is search the twin MC database for an earlier and later bike, compare rear shock part numbers and see if they're different. If they are, its a good bet thats all you need and you can just buy the whole assembly.
For an aftermarket solution, find the spring rate by asking EBR, testing on a scale/press, calling Racetech, Hyperco, etc. and see if they have something that will drop the bike and still be good for your weight. IMO, The front can be lowered up to 1" by cutting the spacer, but the right way is fork springs.
IMO to drop it 1" evenly front and rear is acceptable but he's right though, messing with a bikes height and spring rate better be done correctly. You already on a low seat?
*check that info first, I'm old and memory fades with every beer.