I do not know anything about pro link retract,brake sets except prolink has a good history as far as I know and Dreamworks has great products. Will check-out servos as you are using. I usually go with Hitec but may try some of the Turnigy MG. I have been using Springair retracts in my Boomerang intros and Nanos. Have about 290 flights so far on Boomerang with springair over 7 Years with no failures, only bent legs.
Thanks for info on servos.