The kind of pulling away you are talking about is a world apart from the starting grid of a race.
One summary piece of information I was trying to express, but realise I didn't spell out completely, is that you should have the throttle wide open and balance the revs with the clutch, don't try to balance the revs with the throttle.
With practise you will find there is a speed at which you can finally dump the last bit of clutch completely in one bang and only just avoid bogging. Once you get that down it gives you something to shoot for.
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