Yes. TB, CLE, and NE.
And not to drag things out or debate things, the Patriots winning percentage for the past 18 years has essentially been the same in division, in conference, and out of conference. They won at the same clip no matter who they played. Certainly it would be impossible to prove, but if they had played in another division, all that would change is the teams in that division would have lost a lot more . . . and people would say they played in a different weakest division other than the AFC Least.
As for your 6-0 comment, since 2001 they have gone 6-0 in the division twice, 5-1 eight times, and 4-2 eight times. Sure, their division likely has helped them, but BUF / MIA / NYJ out of division records have been better then other division's out of division records (AFC East divisional record not including NE was middle of the pack last I looked at it). Put another way, in those eight 4-2 (.667) seasons, that lowered their overall winning percentage (usually .750 to .875 in a season), meaning they won at a highest rate OUT of their division.