I am trying to tune my four string p-bass to C-G-C-F. if i use a set like the D'Addario pro steel super light gauge 5 string set and drop the highest string and use the remaining low four on my bass could i essentially "tune up" those strings to the notes I'm looking for without cracking my neck? the whole reason I'm trying to use the heavier gauge strings is that i find regular strings to be too floppy when tuned down a whole step and way too floppy tuned down a whole and a half (my low C). my biggest problem is the low C.
here is a link to the string info:

"http://www.daddario.com/DADProdDetail.aspx?CodaID=1082&ID=3&Class=ACGA"
here is a link to the string info:

"http://www.daddario.com/DADProdDetail.aspx?CodaID=1082&ID=3&Class=ACGA"
