Stage VIs, unless they're the MW version, do NOT require anything special in rocker arm offset. Do the MP rockers you have now interchange between int & exh, or do the intakes have more pushrod offset?
How is the valve sweep pattern w/ the MP rockers? Crane used to make the MP rockers and they typically "fit" the Stage VIs OK. But on occasion MP would have some bizarre QC screw-ups that totally hosed the rocker arm geometry... like on MY set.
Proform rockers are JUNK and probably don't fit any BB head correctly.
Increasing the rocker ratio may result in pushrod interference issues that can be solved only by grinding additional clearance on the intake pushrod tunnels. The exhaust have tons of room, though.
BTW, please turn your caps lock
OFF.