I'm not quite following what is happening. If they show up on the radar (however far they look) is how the patrol sees it. What i usually do is look at distances.. and say ok does that look 10 yards from me or not? if yes/no I adjust a multipliier to the xy coordinates so it does. That can work.. but it will break spell distances if you use in game spell descriptions (ie this spell can cast 25 units away) etc. So its a give and take.
But that said, I havnt had to do any adjustments to get it working.. combat is coming along, I should have a memory plugin available in a day or so. You can then compare it with yours.