You will need to get the verbiage of the easement grant, which you have not posted, in front of a local real estate attorney for an opinion.

Easements, once granted, can be very difficult to remove. Easements are "hereditaments" which can mean that they may be passed without any specific reference to heirs or assigns.

An easement clearly granted will unlikely be subject to a later affidavit from the grantor further restricting it beyond the plain language of the original grant.

But these are just my own thoughts and not meant to be the legal advice you should get from a local real estate attorney. These are probably fine points of the law and I bring them up only to point you in the direction of specific and local legal advice.