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@jack25
Thanks for the advice every one, very helpful.
I'm reasonably satisfied that I've done it right reading the descriptions here, the bolt pushes the crank onto the spline creating an interference fit, and when it reaches the correct point on the taper the force required to move it on becomes huge. At this point I did them up moderately tight by applying as much force as I can without doing anything stupid like standing on the allen key.
My gut feeling is that you would have to be gorilla to over tighten with the Park Tool 8mm hex key.