Whatever you do, do not take the shuttle outside of security in order to clear security in Term A.

And if you are on the same ticket, you do not have to "re-check" your luggage, only pick it up and then drop it off on the conveyor belt (IIRC) past Immigration and post Customs.

With two hours you should have enough time to visit a lounge (since you are on Biz ticket). And high status would not help in this process given you are on a Biz ticket anyway.