To be honest removal of swirl marks by hand is going to be a lvery long and hard job, you'd be better off finding someone local who can machine polish the car. Not a bodyshop though as many really don't know what they are doing.
If however you really want to do it by hand, about the best product is Meguires Scratch X. As you have found its wasting time and money trying T Cut, plus T Cut will do more harm than good to your paintwork, if nothing else its ammonia based which means it strips all the goodness out of the paint.