Wondering how this got so off topic... But anyway, this is a pretty well timed topic because I am actually currently in the process of rereading the part where he leaves Tear so I had been thinking a lot about it, so my thoughts on the whole Perrin leaving Tear to go to the Two Rivers thing was the pulling feeling he gets to stay in Tear wasn't actually that strong until after he is just about to leave and by that time he definitely cannot change his mind, when he said a hundred reasons to stay, sort of implies that these reasons aren't actually that good, whereas to save all his friends and family and the rest of the people in the TR was a very good reason. But the tugging to stay with Rand was sort of like a reverse psychology sort of thing to set Perrin in his way, as once he got to the TR realized his plan to give himself up to the whitecloaks wouldn't have worked he would have just been sitting there twiddling his thumbs, but with the sense of purpose he had from the mental battle with Ta'veranism he had the willpower to rally the people and defeat the trollocs, send the whitecloaks away, unite the people of the TR and create a seat of power that has decent strength.

Thats my two cents, not saying it's definitely what I believe or if it's any good, but thats just what I came up with as I read.