Contact George Anderson...he is old school, so does not have a website, only a phone number.
Home: 309-762-6291
Cell: 309-236-0952
He makes a really nicely machined plate that has holes to move the TP back 1", 1.5", or 2.5". Nicely made part, powdercoated black so it's invisible, and takes about 20 minutes to install. Works like a charm. 1" back was just right for my BSR...it puts it back where it ought to be from the factory. My BSR is 5'3" and 125lbs, so 1" back was perfect. Depending on the size of your BSR, you may have to go back further.
George is a GREAT guy...he will ship you the part before you even mail him the check (no PayPal or Credit Cards)...THAT's the kind of man he is. A BUNCH of people here have his TP relocater on their bike.
Remove the TP liner and make sure they've got the TP in the most rearward holes...there are two sets of holes, and the bikes come shipped with them in the most forward position (used to, anyway) and sometimes the dealer "forgets" to move it back. You're probably going to need George's product though...the Lumbar support takes up at least an inch of room, but is nice for the BSR's back when all is right.