Ah, the Metropolitan. Totally slipped my mind, and it's one of those regular rotation pens.
Maybe its not as uncomfortable as I imagined, atleast I don't remember it being as such.
Another aspect of holding is the pressure point. I used to hold the pen with the tripod grip but was using more pressure from the thumb...going through the writing lessons corrected that mistake, now I use the index finger for pressure variation, works well with flexy nibs.
I think you are right about that the step needs to be in a good distance from the grip section. You just need to know how high do you normally hold your pens and you'll have an idea if it would bother you or not.
For me the first issue is aesthetics with most pens with a big step. The Metro is still a nice one though.
I mean, like these custom pens:
The proportions are just a bit off, and the step is not for making it more streamline or anything...I'm not really fond of these.
They can be comfortable though.