• It's down to skills.

    I don't see how the shorter wheelbase answer works.

    To make skidding easier less friction is required between road and tyre.

    Friction is proportional to the force perpendicular to the surface.

    On a really long wheel base bike, the reaction acting through the rear wheel is decreased and so it is easier to skid.

    This can be seen by riding a tandem with on one on the back, you can skid really easy.

    Using this we can say that it is actually easier to skid on a longer wheel base slack geometry road bike. So your inability to be able to skid your conversion was a skills thing.

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