Riding position on a K-RS
IMHO, the riding position on a K1200RS is just about right for its intended purpose (movin' at the speed-o-heat).
I bought a '98 K1200RS from a pal, and very soon after I got it I ordered a set of later model handlebar mounts. After they came in, I retrofitted them to the bike. Rode around. Accumulated mileage. Eventually I actually moved the bars down one notch from fully to the rear.
Here is my recommendation. Plan a 400 mile ride. A loop, or just a cross-state boogie. Whatever. Start out early with a full tank of gas.
Go for the "tuck." Rest your stomach against the tank. Pull in your elbows. Let your abs do the work, until you get to cruising speed, around 85 or so, and then you will be in the zone. If the ride involves a steady-state sixth gear run, put the balls of your feet on the pegs and let your heels rest against the passenger peg frame gear.
Notch up the speed a little. Check six. Scan. Keep the elbows in. Watch the mirrors. Is that helicopter just flying around, or is that a bear-in-the-air?
Uh-oh, time to buy gas. Drink water. Whiz. Clean off bugs. Check the bike. Go.