not sure if there is a larger capacity clip or not...(haven't seen any)....but if your clip doesn't drop out when you press the tab it may be too tight to the base plate. mine was that way also and i loosened the phillips screw and ever so slightly moved the plate in the direction away from the snug fit and now it drops right out when it's supposed to.
if that doesn't work,,, try oversizing the phillips screw hole with the next size drillbit and that will give you some more movement.