All base cabinets should be installed to a level line at 34.5” above the high spot of the finished floor. The bottom alignment height of all wall cabinets should be at 54” above the high spot of the floor.

The height of the wall cabinets should take into consideration any fall in the ceiling, and be designed for the shortest distance between the 54” AFF line and ceiling height, rather than the tallest difference.

You’ve designed for the tallest difference, and the molding is too tall for the shortest distance. You need a shorter crown. Then you use starter filler strips, scribed to the ceiling slope. Apply the shorter molding. Done. Cutting down moldings never works, or looks good.

Like said above. Refer cabinet too tall. We usually try for 3/4" between the bottom of the crown and the start of the profile on the sub crown to absorb the variances in ceiling height.

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