Can you use formula to set default coverage value?

Summary:

Can you use formula to set default coverage value?

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The client's requirement is that based on your years of service, for a specific life event your coverage should get defaulted to a set value or your prior coverage if you weren't previously enrolled in the max coverage value. I have written a Coverage Upper Limit fast formula to calculate what the default coverage should be and applied it as an Ultimate High Limit on the variable coverage profile. In my example below, the fast formula returns a value of 2 yet when I process the life event it applies the default of 4 and does not limit it to