I normally love your advice, but this is pretty ill advised!
Why do you think CARS can be "easily improved"? People who struggle with it CONSISTENTLY report it to be very difficult to improve. Moreover, you neglect to point out how easily a 131 in any section can go down on a retake. Advising anyone who scored 4 above their FL average to retake, unless that average is extremely low and, for whatever reason, the person took the test with so little preparation that a retake pretty much has nowhere to go but up, is, in my opinion, SDN malpractice.
In this case, where OP admits he's only looking for another 2 points, retaking makes even less sense than for the more typical person who, however unrealistically, thinks they can do much better.