Touching a tire with even the dirtiest, oiliest, greasiest hands isn't going to matter a whit in terms of the tire becoming more slippery afterwards, such that it makes it likelier to lose grip in a turn. Putting a bike down blows, but even the slightest implication that it was the tire tech's or the dealerships fault is, IMHO, mis-aimed. New tires are slippery, and we need to be careful on them for a few miles until they both warm up and scuff up a bit.
To the OP - I hear you on the repeating cycle, but now that they have a few miles on them, just take some gradual turns at a gentle pace, leaning a little more each time, and within a few minutes the tire will be good to go at any pace one can dish out.
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