The Finishes Graph

Ideally, where should the "bell curve" be peaking on the finishes graph? I have a clear 3rd/4th place peak developing with it trailing off in either direction. Given my relatively low ROI compared to a relatively high ITM, I'm wondering if there is a deduction to be made (e.g., my bubble play sucks and needs improvement or I'm not taking enough (any) opportunities before Level 4 to increase my stack).

Any input?