car pulls to the right when braking

I really hate to hijack this thread, but I am having this same issue, except my car pulls left. Most of what everyone has suggested I've changed. Completely new front end, QA1 adjustable strut rods, new brake lines, new calipers, aligned, Dr Diff master cyl, aftermarket prop valve, etc. After replacing a few things like calipers on the front end, it still pulls left. I also took out all the pressure to the rear line as I could. I was thinking I was having issues with one cylinder not applying as much pressure as the other. But then again, I'm running a spool so how much can the rear wheels, with uneven braking, cause it to pull to one side since they are locked together? I'm a little lost at this point.