I never said the F was efficient at that role, the others definitely have it beat there, even the Prime. About the only the the F has going for it is being cheaper than any of those configs. Only a bit compared to the Prime, but a noticeable margin on the other two. If those points mean I've got the margin to cram an extra Point of Elementals into my force for the day, I think I might actually look quite seriously at the F.