Don't make provocative posts and you won't be judged!

I doubt your "findings". The "bump" could be instantaneous response from a sporty drivetrain. Whereas crud for gas is "smooth" because it is not allowing that instantaneous response. Then again, it could all be coincidental to transmission operation.
Top Tier gasolines got that way for a reason. It doesn't make sense to go with a cheaper grade gasoline just because of a "bump". What kind of acceleration difference is there? If the cheaper gas seems smoother but flatter, then I'd go with the "bump" gas.

And then again, any differences might only show up over extended running time as a cleaner or dirtier engine. Etc.