I assume that by CS, you mean (FICO) credit score, not CreditSecure, right?
If you have balances showing on multiple CC's, however small, and one CC fell off, then this might mean that you have proportionally more accounts with balances. So picking a number out of the air: it was 5 out of 14, now it's 5 out of 13.
We've discovered over the last 6 months or so that if you can do it, your scores will do much better if you only report a balance on one or two revolving tradelines. Do keep using the rest periodically to keep them alive, but PIF before the statement. CCC's don't care a flip if you have a balance report on your statements or not; they just want you to use the cards and make timely payments. (Sorry, you probably know this, I'm just summarizing.)
If you do this, it's easier than trying to keep tiny balances reporting on multiple, multiple accounts, and then paying, plus your scores will probably benefit as well.
In general, you don't really get scoring points for accelerated payments on installment, although it can certainly make financial sense. If you're looking for score improvement, I would throw more money at the CC's, and reduce the number showing balances. Revolving usage carries way more weight than installment.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007