hmm, "BEST"?, do you mean race 7 at each meet? as this is often the "CLASS" race at any given meet, & often the hardest to analyse or rate with any certainty.

if by "BEST" you mean the races that standout because they meet other criteria you have set for yourself, whatever they may be, then you may be headed in the right direction.

&, as with pricing a race, there are no quick & easy ways to rate a race that are consistently accurate or worthwhile, and as rating & pricing a race DO/SHOULD/MUST go hand in hand, if you cant or dont want to spend the time doing tasks that personally i live for, then either use the unitab or other such ratings, or open your wallet & subscribe to a ratings service.

whatever you choose to do, what you must aim for is consistency in what you are doing, unless of course that means being consistently bad or wrong