I am paid less than PWD after I-140 approved


I got my 140 approved, priority date not current yet. My current salary is less than the PWD filed. I under the employer only need to pay the PWD after my GC approved.

My question is, will I get any problem when I file my 485? Will USCIS ask me submit all the W2 and paystub starting from PERM approved? Will USCIS issue RFE for company "ability to pay" issue?

Really appreciate any relate information and experience