Have I taken this folding thing too far?

[The once and future king]

From your post it looks like you dont understand EV and other concepts properly. Especialy as you ask- "how did the sng turn out"

Making the most correct EV+ play is everything, the result (in the singular) of that play is irrelevant. If I make the right play and lose a particular hand/SNG, it dosnt matter because over time that play will show a profit.

All profit in the long term is the result of making the right plays and the aggregate effect of the result of those plays.

You may fold the best hand and look for another spot but this is costing you equity/ROI.