Seller A's DSR scores are:
But you can't see the sellers 30 day numbers and those are the only ones that really influence Best Match.
Could you tell me where you find that Best Match is derived from DSR's and time ending?
From a multitude of posts by eBay staff, from various announcements, from various off site interviews with eBay execs etc.
It's impossible to know the exact parameters used for Best Match, even more difficult as they are in a constant state of flux but here are the basics.
Keywords
Total Price including shipping (for fixed price)
shipping amount (for auction items)
Seller 30 day DSR ratings
Seller non-performing seller rating
Location of item
Location of Buyer
Time ending
Sell thru rate of similar listings
Click thru rate of similar listings
Buyers previous history
Plus others I don't know or can't remember. Each of these factors is weighted as to their impact, I've heard that Keywords and time ending still constitute the most influential factors but I don't know if this is true.
It's quite clear that dsr's and basic feedback percentage are only minor factors if a seller is getting "standard" exposure, they seem to be used more to tweak the basic Best Match results.
eBay will never fully divulge the parameters used, if they did there would be wholesale attempts by sellers to "work" the results. As it is sellers have discovered a few things that have been effective (repeating the word NEW in the title worked very well) as soon as eBay caught wind they made adjustments.
Regardless of whatever problems you may have with Best Match it is certain that the only goal is to increase sell thru rates and average selling price. For sellers as a whole this can only be good while for a few there may be some suffering. It's far too early to say if Best Match is going to achieve it's goal but we will find out when eBay get around to crunching the numbers and Best Match either stays or goes.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.