Hi, dog, I don't suppose that you're on Score Watch, are you? If so, did you get an alert with a score drop that indicated that you had been re-assigned? (I can tell you're familiar with this, as you're using the "envelope" term, which is another version of buckets, scorepools, and so forth.)
I have to admit, if all your lates are over 24 months, and everything else really is OK, and your util is low, I don't know what the problem is. I can also tell that you know how to time your payments, so I'd say let half or fewer of your CC's report a balance each month (maybe 3-4 max), and keep it between 1-9% on each card.
Also, if you are pulling FICO's (please say you aren't looking at FAKO's!), what happens when you play with the EQ and TU simulators? The projected numbers aren't guaranteed, but you can sort of see what it wants you to do with the best case scenarios. You can also play with the other scenarios and compare the projected scores. The higher the projected score increase, the more FICO values that behavior. And if it says pays down your revolving balance over 24 months, that just means behave yourself for the next two years. This is a vague and tedious way of trying to figure out what FICO wants, but sometimes it's all you get.
* 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