i have a 2004 phamtom 11 with straight limbs with "a" cams 27.5 draw lenght and set at 45 draw wieght with only 215 fps what can i do to speed this bow up ???? what if i put 14"magnum limbs on this bow with "a" cams will this speed this bow up ??? i would like to speed this up to at least 250 fps or an i only dreaming ???? any help will be appreciated thank you