Form I-485

1. While I am moving my H-1 New Employer B, What if something goes wrong during H-1 transfer or after that in GC processing with new employer like RFEs etc comes up, can I move back to employer A if employer A is willing to take me back. Does AC 21 portability rule applied to my case also? Since I have not filed I-485 yet, as per my understanding this rule does not apply to me. While my GC is in process with new Employer B and I am in waiting mode for I-140 approval with new employer, What will happen if my time to extend H-1 petition comes up.
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2. Can I still extend my H-1 with new Employer even if I-140 with new employer is in process and not yet approved. Can I use my old Employers approved I-140 to extend my H-1 in this situation.

My question is about switching from an H-1 to F-1 visa. My six years of H-1 expires in March 2018. I have received an offer for a Phd. at Stanford (starting Aug. 2018) that happens to be one of my dream universities. My employer applied for a PERM back in August 2017, it has not been approved yet. Does the filing of PERM interfere with getting an F-1 visa. I know you’ve answered this question in the past regarding an I-140 and I understand that my chances with just a PERM are slightly better ?

Have an I140 approved with a priority date of Oct 2009 under the EB3 category and worked for the same employer for over 10 years from 2007 - 2017
I filed for my AOS in December 2017 using Cross Changeability since my spouse is born in Malaysia
I left my employer after 2 weeks of filing the AOS for a better opportunity in terms of Compensation
I used my approved I140 to get three years of H1b extension. My new job and position are in the same category and my new employer is ready to provide Supplement J if needed
It has been almost two months since the filing and have received all the receipt notices and have also done the fingerprinting and haven't received any RFE Yet. Do you foresee any issues arising in near future and jeopardizing the application because I left my employer before 180 days of AOS pendency?

Come to US on green card EB2 (future employment base GC) consular processing. At the time of green card consular processing interview my employer offer letter mentioned my job title as “Programmer Analyst”. My employer is a consulting company and after coming to US on GC, I got my first contract project at client location (while full time with my GC sponsoring employer) with job tilte as “Architect/Project Manager”. But is it having similar job duties as my GC employment offer letter? My question is at the time of US citizenship interview will it be problem because of different job tittle between (GC offer letter and actual contact project at the client site), but similar job duties?

While submitting application for 485, must the primary applicant be on a project? My husband is a consultant on H1B, the employer has filed for green card - should my husband in a project during the 485 submission; will a between projects situation be an issue for filing 485?