I have the exact same problem, with one difference. I had a BK discharged 3 years ago, and have built up credit since, with perfect credit since the discharge, no lates, but one paid collection that was a medical receivable dispute that got all screwed up, and that was paid two years ago. My score reached about 640, but since has fallen to about 610.
last fall, when my score was 640, I decided it was time to get some credit (I travel and entertain on business, I really have to have this), so I reached out to quite a number of institutions, and was able to obtain maybe 5 cards with credit lines from $3-$5K each. It took approx. 12 inquiries to do this. I also got a car loan for my son, and one small promotional Juniper Visa with a "same as cash" deal with Apple Computer, when I bought a computer. All this credit is paid as agreed; some cards have balances; some do not.
I also kept the very small balance cards I obtained in my first post BK year, not because I want them, but because I want the credit history longevity. So despite another year post BK, and despite the perfect payment history, my score dived 30 points!
Is this just due to the addition of new accounts? Seems unfair to penalize me for good credit payment history! After a period of one year from most of these new accounts (November, 2008), would I expect my score to suddenly revert?