[Pierre Caillet]

Well, if you gain only hundredths of second, it must be these variations are not enough. And it would be surprising if they were, since you're applying the same method and therefore should get the same results. For example, I don't know if you're in the habit of doing this, but in turn 1, when you press the accelerator twice before really going for it ? That's several tenths right there, garanteed.
Rather than a variation on the same theme, what you need is a new score. Try to reassess every corner completely with the objective to accelerate as early as possible, without hesitation and without gap between the end of your braking and the beginning of your acceleration.