Well--I'd have to recommend RFB for 1.4 (also modded in 1.5x). The issue with stock escorts is their active sonar range is too short. (My opinion). If you go deep and under the layer, the poor little guys really don't stand a chance. In RFB the ranges have been extended while still making evasion doable. It all depends on what you run into for crew quality of the escorts and the weather conditions--both huge factors.
Or you can go here:
http://files.filefront.com/Prolonged.../fileinfo.html
and down load my original modded AI_sensors file. It should work well with stock 1.4 as it's what I originally tested it with.