10 wheels: as I reread my post above, "I had to add more rear brake" looks ambiguous. I meant adding to the front braking I normally start with. But my firmer point is that even if I do not possess the perfect braking technique of fietsbob, why is my technique suddenly so catastrophic?
My opinion is, for WHATEVER reason, this specific tire is skid-happy. Sorry fiets, it aint me.