Your analysis appears to be correct. Your W-2 and pay stubs would be relevant for showing that the current employer is capable of paying the salary for the PERM position, esp. if it appears that the employer would make a net profit after paying the salary amount stated in the PERM application.
The I-140 filed by the new employer should request porting of the priority date of the original I-140. Please schedule a consultation with an immigration attorney if you cannot communicate effectively with your current attorneyl
No, that is not a "standard requirement" for the new I-140 to be filed by your current employer. Strange, but I don't want to second guess your lawyer. He or she should be in position to give you a clear answer as to the rationale of such a request.
Yes, your understanding of the focus of the "ability to pay" requirement is correct.
Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Have you traveled since your previous PERM filing?
This response is general in nature and cannot be construed as legal advice, given that not enough facts are known. Any comments offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship. You are encouraged to seek independent and private counseling for a complete review of your case.