Maybe i need to not want a d color vs1 ideal cut
I haven't been here long but the message I've got from Pricescope is that a lot of people would prefer to go down the scale in colour and clarity in order to maximise the size.
Your stumbling block seems to be that not only is this e-ring not being lovingly bestowed upon you, it is something that you know has the potential to cause on-going friction into the future. It's true that we can do whatever we want but we also live with consequences. Of course the consequences can run the other way also, no matter how beautiful the ring you get, you may resent that he played no part in getting you a ring that was important to you and in fact he resented the money that was spent on it.