HiI took all three approaches. I put in a ZX1100D shock, which raised the bike approximately 1/2". I mounted a Corbin Gunfighter, which raised the seat height some (maybe 3/4"?). And put on some custom Tarozzi rearsets, which moved the foot position back about where the TBS set is, but dropped the foot position about 1".
Makes for a pretty comfortable ride for me, 70", 32" inseam.
Do you have any pics of your rearsets?
Did you get them made specially as they don't list triumph bikes.