Well I know that each of the card issuers have been reporting as "OK" each month and not as "ND" (meaning No Data). And each of them report "Date of Last Activity" as the current month (except one, which I explain below) .
As far as how much I can pay down.. I just paid $610 toward the larger balance account (following the advice of the first reply to my OP), and another $75 toward the smaller balance card (making the bal due $311 on small card). I would say I could pay another couple hundred dollars, possibly even the $311 required to pay off the small card, if it would help. I'm not too thrilled I already paid $610 and saw no results because that was the amount I wanted to pay in total. I'm thinking I should have paid off the smaller balance card all together, and then the remaining $300 toward the larger balance card. Again, I could pay another few hundred dollars if you think it might help.
Side note: In regards to you suggesting some things may not be reporting (still a bit confused by this)... I have a credit card that was Household Bank but got bought out by Cap1. The Household Credit Limit was $1,305 and the new Cap1 is $1,705 (received a $400 CLI from Cap1). The Cap1 is reporting every month, but the Household account last reported Feb-12. From everything I've read, the $1,305 should count toward my utilization. It's reflected every month so far, even though it's basically a duplicate. I look at it as an error that's working in my favor 
All of my reports indicate a Util % consistant with the figures I have in my previous posts, and the percentage counts the old Household Acct.