CAM HELP NEEDED!

If you want less duration your gonna generally get less lift unless you go roller and higher ratio rockers or at least faster ramp flat tappet.
I maybe miss understanding you on this so don't take it the wrong way. RV- torque cams have short duration and more lift. Example: .479 / .494 x 255* / 261*. That cam has almost a half inch of lift while it has a short duration. Again, I may have misunderstood you