• I will just use my assumption based physics (what can go wrong with that)

    A body of weight further away from the point where the front wheel touches the ground is going to take more effort to lift due to basic leverage. Centre of Gravity doesn't matter as it still as lifting 2mm is lifting 2mm (or enough to make back brake redundant)
    If the rider sat 100 metres back from the front wheel it doesn't matter how much higher they are sitting, they are not going to be lifted as easily.

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