Flying HNL-LAX-EWR-DEN-HNL next week.

Overwaters (HNL-LAX & DEN-HNL) are UA flights on UA metal.
Transcons (LAX-EWR & EWR-DEN) are on CO metal (757 & 737, respectively) with UA codeshare flight #s, obviously.

Question: how will UDU work for me as a 1K on CO metal? Anyone have any experience as a 1K on CO on those routes?

Branch question: if I use a CR-1 instead of hoping for UDU, does that help on CO metal as well these days?

Mahalo! ^
Ted