I generally find the CB to be mostly accurate, probably more accurate than us
That said, as people level, unless it's an entirely new PC, such as Tryn or Amarande, one way people could help expedite is by noting what changed. That way if I've reviewed Rumbum at 5th, and he gets a New Axe, some gold, and turns 6th level, I know I just have to check that the level bonus went up, that his axe is correct, and all the attacks flow from that new math.
That said, it is very difficult to review, so not sure if there's a better way. I know spreadsheets should be better, and even though I work with them everyday I find it very difficult to review the handful that are done with them in L4W. Maybe it's Google Docs as I'm used to Excel, and it's a painful transition as all my shortcuts are gone.... who knows.