Essentially,
Dan, you should ensure that:
IDC2 is connected to IDC2, to IDC2, to IDC2, . . .
IDC5 is connected to IDC5, to IDC5, to IDC5, . . .
and no others are connected. The wire colours used does not matter, as long you use one twisted pair (i.e. the green pair or the blue pair of the orange pair, otherwise you will suffer from the effect of "split legs") and that the cable is
CW1308 specification. To avoid future confusion, it would be best practice to use the blue pair (b/w to IDC2 & w/b to IDC5).
If in doubt, just continue as you have been doing and ask the question. Pictures of any problem area would also be appreciated.