Find Max Value Of Dynamically Changing List

my file was too big to attach, so to get it, go to [url] (p: SOCIALCHARM [all caps]). It's the only file underneath the 'documents' section.

This is a complex sheet, so I won't go into everything I'm doing, but really just the part I need help with. Instead of trying to explain it abstractly, I'll use a a concrete example (you'll need to look at the sheet to understand this).

The general idea is that I results from an online ad campaign (ie I ran ad X on site Y in position Z), and - given the results I have - try to optimize which ads I run where. Each in the real data (row 167 and below) represents a 'space' where an add can be run.

First, row 551:
The original recommendation is in Column T, which is Brand "Buddies" (column V). The total # so far for brand "Buddies" (col W) is less than the limit, so Column X = 0, and the updated recommendation (Column Y) is just the original recommendation from Column T.

Now, row 552, (the condition I'm having trouble with)
The original recommendation is in Column T, which is Brand "Pink" (column V). The total # so far for brand "Pink" (col W), however, is now OVER the limit, so Column X = 1. This means that excel now needs to search all of the creatives (in column E), filter out all the ones that don't match the size of the current creative in question (ie that are not of size 300x250 - E551), ALSO filter out any creatives of brands that have already hit their limit (in this example, brand "2-in-1" has already hit it's limit, as you could check by looking at X537), THEN, from the remaining creatives (ie those of size 300x250 and not of brand pink OR of brand 2-in-1), select the creative with the highest value in Column AI).