Why are you using the Rolock 90 instead of the Ellipse? Is it because of the suit that you are using? How is the Rolock profile compared to the other systems you've used?
At one time I had purchased, used, and/or handled every dryglove ring system designed to integrate with the Si-Tech QCS Oval wrist ring system.
The Ellipse ring system works very similar to how the Waterproof Ultima DGS works. The primary issue I had with the Ellipse rings is that the oval shape means they have to be indexed/aligned when initially setting up and then each time one dons the glove rings. I already had the Ultima DGS rings and found it easier to Don that system when I had all my gear on because it was round and it did not need to be snapped together as "precisely".
Eventually I tested and reviewed the Rolock 90, and found of all the systems I had used and/or handled it was the easiest to set up and use...particularly when fully kitted up on really cold weather days.
It is important for me to state that I was not concerned with the "low profile" of the system. I was purely trying to find a system that was easy to setup and easy to use...those were my priorities. If one's priority is a ring system that specifically has a low profile profile, then the Fourth Element Ellipse rings will meet that criterion.
-Z