It needs to be based in reality for me and the facts are Vader had just got out of an awesome rejuvenating bacta bath and one of those dark force masseuse dudes probably had him feeling like he had limbs again. Full of all the dark force from his fortress, Vader was super attuned at the time, so chasing the Tantive was pure force magic. In contrast, the millenium falcon deal was Vader just being tired.