Switch If and Else to compare multiple months

Hello,

I am trying to use if or switch logic to complete the folllowing. I work for a collections call center and customers will roll throught these things we call buckets if they become delinquent or they will "cure" if they pay off the loan.

I created quick measures to compare each year to the previous. However, the method I chose to use is creating a new column and creating duplicate customers (loan_num) for march (I circled an example in blue).

I want to be able to compare there statuses for the three months without March creating a new row, which is causing what I wrote below to be innacurate. 

Any takers on what I can do to improve this logic?