Since this is a rare occurrence and I've never heard it come up before, I have to ask. What is causing the need to raise the rear end?
Are you experiencing a lack of ground clearance while cornering? If you're a heavier fellow, I assume you've installed the proper weight springs and had your 11 year old shock freshened up. Those would be my first steps I would take before steepening up my steering head angle possibly causing twitchy steering.
The next thing I would look at when I'm experiencing ground clearance issues is my cornering body position. I find that just solidly turning my head into the corner, pointing my nose & looking where I'm going, opening up my shoulders and dropping my inside relaxed elbow just a bit will save me another degree or two of lean angle compared to just sitting upright on the bike.
Now if you already have the knowledge, skills and ride like Rossi, disregard my amateur assistance and jack that ass end up. I just think the FJR has more lean angle capability than many of us are able to use safely on the street provided we don't sit on it like a sack of potatoes.
You can see the long shadow in this picture as it was taken during the first session early in the morning before I got comfortable riding the big FJR on the track. Its a good learning tool since I was attempting to hang an ass cheek off the bike to conserve lean angle which isn't a bad thing but look at my upper body. My upper body is crossed up. My head, nose and eyes are going the right direction but my shoulders are not slightly turned into the corner. You can see the tension in my crossed up upper body just by looking at my elbow and shoulder position. After getting relaxed and loosened up, I was able to correct those problems and let the bike work underneath me. I wish I could've had this same picture after lunch to confirm what I was feeling after making some corrections.
By the way, on track advanced riders schools are a learning blast. This was one of the best days of my life although I was forced to ride my FJR after loaning my Ducati 999 Superbike to my son after he sold his R6 the week before our advanced rider school. It turned out being one of the best things that could've happened as it forced me to learn so much about the FJR's capability that day.
My two sons and I.