Well, nothing to lose at this point.
Simply does not make sense that stock-settings do not work. Which is a sign there's some non-stock specifications in engine somewhere. That can be measured. If changing cam-specs changes behavior, then something is really non-stock spec in system right now. A degree wheel and dial-indicator to measure actual valve-travel all 720-degrees around would give data to track down what's not stock.
Unanswered clue is why bike changed back to good behavior with Seafoam. If only temporarily.
Also not answered is why one cylinder would be off? Cam-lobes are synchronized. Crank-throws are synchronized and fixed. Unless one cam-lobe can rotate on shaft and change their timing or one crank-throw can rotate on crank, it simply doesn't make sense how one cylinder can change without other*.
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