on an etek use fire mode 3 (= ramp 1, or PSP)
on an ego, its plain old RAMP1 in the menus
hope this helps.
Personally i think whatever ramp mode allows you the easiest way to attain 15 (seeing as everyone is using ramp, might aswell use the "best one")
hence why i prefer PSP over the other 2 ramp modes.