OK, just got response from BBS. They recommend performing initial setup at 130mm, then after the first glass stabilization of the frame, when re-configuring the jig from horizontal to vertical prior to carbon layup, the rear stays are quite mobile and I can add the extra 5mm spacing then using supplied spacers. Should work, but a bit worried I'd lose equal spacing from centerline if one stay gives more than the other. am I worrying too much?