i feel that if you want to use the autobrake go ahead. shouldn't be greater than 2 unless needed. with a tail wind depending on field length i would use it as well. although when you have a 12000 ft runway why use autobrake or brakes at all. reverse has more effect at high speeds anyway.
your approach seems fine. i think that the other guy just wants you to see what the plane can do. i like to test my ability at times but only in a safe enviroment. it is anoying when someone is real slow and conservative unless you are over gurantee then the slower the better.