If you said that when you "got the new tires and alignment done, it was slightly improved" - it could only mean that your balancing of tyres need to be attended to.

If at all balancing did little to remedy your vibration - then it could be possible that your wheel is damaged somewhere.

My 300SE used to have terrible vibrations.

We found the fault as follows:

Balancing was worse on Dunlop, and improved on Michellin - changed all 4 to Michellin.

Balancing improved with less vibration on steering wheel, but noticeable at 70 mph upwards.

Changed all 4 tyres, and the balancing/vibration has since stopped.

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... Kerry

126 tailed by a 203, 129 leading the pack.