I'm using my B-1 on it with about the same amount of water. I may have to try my B-2, it's more restrictive, and this being 18mm, it might change it up some. It's something to try other than adding more water. I think the water's right about where it is for me, but it's still a little too much volume. I could add some water, but I don't like dumping out that much water so often. Luckily, or unluckily for me, I'm often bad about changing my water when I should, so maybe in reality it's not really THAT often. Also getting the last little bit of water out when dumping it can be a little tricky due to it's shape.Mine arrived last night and tried with B2 with Shovelhead bowl. Water an inch from top of base. Got very high but need to dial in devices and water levels.
I'm still liking it very much though, I just need to dial in the water level a little more. I've got an 18mm drop down on the way that I hope fits. It's a great piece other than taking a little too much water to fill for me, and that's just personal preference.