Pit boss heath dramatically increased?

Playing on eternal: Since the start of season five, the Pit bosses (at least at level 61) seem to a have quite a bit more HP. During season four I was able to complete level 75 or so without a problem. Now at just level 61 I get through to the boss with 7-8 minutes to spare - and wack away until time expires without getting him down to 1/3 health. Was this intended? I know my build is just casual, but I’m still doing the same 4-5 mill damage per crit hit as before.