Hi

Don't know about those wheels. Had a look on the web and the spoke count is a little lower than most would recommend for clydes, but they look robust enough.

My riding is very similar to yours, and my experience has been that machine-made wheels are a world apart from hand-made wheels. the compromise is to have machine-made wheels re-tensioned by hand. Spoke quality, material, and nipples are all factors as well.

Machine-made will go out of true fast -- 100 miles or so. Hand-made should stay true for at least 500 miles, if not a few thousand.

My JTS has decent wheels stock, and i had them hand-tesnioned (though not rebuilt) and they stay true enough not to worry for 2-3k miles at a time.

The difference between 23 and 28 tires should not make much difference. Ride on max approved pressure (even more important with the 23s). I'd recommend going back to the shop and asking them to re-tension the wheel (rear especially). Fronts generally aren't an issue, which makes me think either it was that way all along or you hit something or knocked it somehow.