Its all a big compromise. The lighter the rocker, the less valve spring needed to keep the valvetrain stable at high rpm. In the same respect, the straighter the pushrod, the less lift required to open the valve an equal amount (tangents). The rocker weight could be overcome with more spring pressure, but there is no real cure for bad geometry.
I would say for 11k rpm,keep the pushrods as straight as you can and thats unfortunately the rocker length you end up with. If you can alter the fulcrum point, keep a mild ratio. It sounds like you need a DOHC Hemi!
