Folks, finally my EAD status changed to "New Card is being produced" yesterday.
Senator had to follow up again, Senator's office told me this time they reached out to USCIS over the phone and got a specific response about my case from them.
Anyways I'm super happy....Yippppy!!!! 😎
I would suggest don't lose hope, continuous follow-ups and patience is the key, provided you have a genuine reason to convince USCIS and Senator/congressman
Here is my updated timeline
08/27 - Filed for AOS/EAD along with 485 at MSC
10/29 - Requested expedite
11/13 - Got letter asking additional evidence
11/15 - Faxed all the details
11/16 - Senator followed up
12/17 - Senator followed up again (via phone)
12/19 - Got specific response from USCIS (not the generic one)
12/28 - Status Changed to "New Card is being produced" (MSC is super crazy even my expedite request took 2 months 🙄even holidays during my timeline may have added up the days)