Ideally, you would get a new brain MRI and MRI of the orbits at the same time, both with and without contrast. Having them done together adds only about 15 minutes. (How long ago was your last brain MRI?) If your eye doctor can't do it, your PCP might be able to.

As far as the Tesla, there is an interesting thread about this in our "old place". (I recommend you taking a look at the thread.) I thought that living in NYC I would have access to state of the art machines and I was a little dismayed that the place I've been going to has 1.5 machines. I was also CONFUSED because they told me they "update" every 6 months! It was explained there that it is the quality of the machines (not necessarily the Tesla) and although my question on this is still pending, possibly (because of that "update" thing) the imaging software.

One idea would be to call an MS specialist or neurologist in your area and see what facility they recommend using. Hopefully they'll be forthcoming with a recommendation even though you're not a patient and it's possible that the place you've been using is okay.