Hi sveniga4,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function, your CAT score results show that you essentially performed the same each time (+/- a few points). Assuming that you took each of these CATs in a realistic and test-like fashion, then your current ability level is likely in the low-700s. At your scoring level, the GMAT becomes really 'sensitive' to little mistakes though - if you make a few too many, then a 700+ score becomes impossible to achieve. In that way, you shouldn't be focused on how 'spread out' your wrong answers are - you should be thinking about WHY you got those questions wrong. If they were 'gettable' questions, and you made some type of small/silly mistake, then THAT is something that you need to keep from happening again.
As an aside, you really should be taking just 1 FULL-LENGTH CAT per week. Taking more than that (and taking 2 CATs in 1 day) is not likely to be beneficial - and you'll just end up 'wasting' CATs.
GMAT assassins aren't born, they're made,
Rich