The thing is you can't control anything. HR promotes you when they do, unless your SLs intervene for the better or for worse. Promote early, promote late, doesn't matter whether which one is better. You just get promoted when "it is time".

The only say that you have in the matter is: you can reject the promotion. But who knows when the next one will come. Maybe by rejecting a promotion you self-condemn to hentak kaki forever. Nobody dares to do that unless they already have a solid exit plan.