mkdd all cup tour

HOW THE HELL DO I GET PERFECT

a year ago i was able to some how mickey a 160 points all cup tour with toad and toadette in the toad cart on 150cc, trying to reattempt it now and am getting SLAUGHTERED. using bowser jr and diddy kong on barrel train, farthest i made it was 140 points and got 2nd on course 15/16. been at it for 2 days now, please help (or skill issue)