Categoty: Family - spouseHeyy,, ill try to answer based on my experience,
1:you are not the main applicant anymore/ principle applicant, its your spouse. So put him/her as an main applicant
2:i am afraid i dont have answer to this question….
3: did they ask for the PCC? If yes you need to submit it (NEW PCC)if no, there is no need they will ask in the future.
4: your UCI was useful when your spouse didnt had one, but now when they have a UCI, put theirs not yours.
GG.