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I would have said tyres first - as I had problems - plenty of tread but old carcasses - and they took a deflection, then were balanced with the deflection in them, and then were out of balance when I had warmed them up. I also had prop shaft problems and that was a higher frequency vibration - it wasn't the bearings - the damned thing was bent. Someone must have used a jack on it, or let it down onto it. That only cut in at 75mph, and by 85 mph your vision was blurred and your fillings dropping out.

I have once had wheels balanced on the stud holes - there is such a thing as a 4 bolt expanding adaptor plate (and probably 5 bolt) - but I haven't seen one for years. These were Cosmic alloys on a Rover P6 - it turns out the main problem was that one had a lateral wobble - which is why they had trouble balancing it - I thought it was because the centre hole could be out.

I suppose you can check your centre hole with a dial gauge or scribe, by turning the wheel on the car with it on axle stands and see if you can spot any run-out. That would also give you the chance to look and see if you have a dodgy tyre - e.g. a bulge or summat else. Maybe one of your new tyres is defective - it can happen - but I think its pretty rare.

Steve