My suggestion would be to just make 31 rungs:
F8:0 = 0.0
F8:0 = F8:1 + F8:2
F8:0 = F8:0 + F8:3
...
F8:0 = F8:0 + F8:32
Put them all in a subroutine and they won't get in your way. I've tried the JMP/LBL thing before, yes it is compact but it can adversely affect your scan time.