I go with the checklist, they say introduce fuel at this number, that's what I do, and I feel uncomfortable letting the motor run out there, any longer then it has to...that saves my starter, which I might need, up in the air for a start..
You see, the thing is in professional aviation, as opposed to google guessing work, checklists change. Quite often in fact. Based on prior experiences.
We had such a change regarding engine start half a year ago. Before we would introduce fuel at 25% N2 or max motoring (max motoring defined as an acceleration of less than 1% N2 in 5 seconds) but not below 20% N2. Now it got changed to wait for max motoring in any case. Starter duty cycle never represented a problem since that change, not even on our old engines, but all starts generate a much lower max EGT.