The past shoulder pads might be of interest. They're not that thick, but rather rely on a bit of stiffness to spread the recoil across more shoulder area. They're not real comfortable, and none-too-sexy, but they're incredibly functional. The .270win doesn't kick much, but a hard, narrow, unforgiving buttplate will get old - as you mentioned - so throwing a thin, yet relatively stiff pad on your shoulder might be just the ticket.