Assuming your golf game is really good and under normal circumstances you could win, do you think you would play your best golf right now?
If things went well I think I could keep things going. A double or triple bogey given my current condition could cause me to come unglued whereas ordinarily I could probably get through it.
Being calm and collected certainly helps and a proper amount of cortisol makes a big difference in maintaining such a state no matter the circumstances.
__________________
"In my experience, if you stay with the essentials you WILL build a repeatable swing undoubtedly. If you can master the Imperatives you have a champion" (Vikram).
The reason you can't sustain the lag is because you are so eager to make the club move fast (a reaction to the intent of "hitting it far"). So on a full shot you throw it away too early, which doesn't happen for your short chip. (bts)