I dont share the other commenter's criticism of the structure of your comment, but I have to admit to being a little unimpressed with the twitter suggestion. The US/Pakistan relationship is something that I find very interesting and confusing. Maybe the most recent tweets are not indicative of the normal quality? You have to hope that the linked twitter account is not the best source out there. The books you mentioned are certainly part of the standard literature as far as Af-Pak politics goes, but they say little to nothing about the India/Pakistan relationship or the multitude of Pakistan's domestic conflicts.