They won't affect the alignment. All they do is change the effective offset of the wheel so you have a bit more scrub radius hence why the steering feels a little different, but the wheels are all still pointing in the same direction relative to each other.
Did you go with H&R spacers? Conceivably spacers could cause a wobble if there was a bit of dirt trapped under them or they hadn't quite seated properly on the hub. It would feel like an unbalanced wheel, but you'd normally see that at higher speeds than 30-40. If a wheel was mounted so far out of true it wobbled at 30, vibration at 60 would be pretty vigorous.
Tbh it sounds like a bad tyre, but that would be unusual for a premium brand like Michelin.
Maybe before you take them off, just jack each corner up one at a time and spin the wheel to see if you can visibly see any run-out in them. Wobbling the steering wheel is definitely something on the front axle.
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