Consider this, if you will. (bear in mind, I'm comparing this to a run not including the boss fight. People do that, right?)
I have not tried this, but what is the profit margin of doing the first two floors of FSC? If each floor pays the same, would it be faster with this approach?
Feasibility fails If any of the following are true;
A. The lower floors pay more than the higher floors
B. Either of the first two floors are more difficult, or take longer than lower floors.
Agree? Disagree? Other thoughts?
You get the most profit from depth 27 and Vana himself, so I would say no.