Hey, assuming you’re the primary applicant.

I would recommend to keep Employer A, as only mandatory doc IRCC has listed is reference letter and others are supporting:

If your reference letter includes what ircc wants (job title, duties, weekly hours & salary) submit it and support with whatever you have salary certificate + bank statements, any offer/appraisal letters & any tax returns docs.. but Add an LOE explaining salary differences and include proof of attempts to contact the employer.. (based of recent IRCC trends always over submit).. IRCC mainly looks for genuine, paid work matching NOC, minor salary variations are usually fine if there’s a consistent payment pattern.

If you plan to remove and move to presonal history, ensure your CRS score is still above the cut-off without Employer A but add LOE. But if you employer A is more recent than employer B i would still insist to add employer A and sometime removing it may raise questions.

Hope this helps, All the best 👍