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I'd 1st check that mounting face for that wobbling wheel is clean and free from any burr/ or debris that could result in the wheel being bolted up on the skew
I'm assuming that you've had the wheels balanced already but one other thing to check for which isn't covered by a balance check is out of round or bent wheels, if you use a dial gauge on the axle to measure the run out on the wheel rim this will ensure that the wheels are round and true
Ok just increasing the wheel rim size shouldn't result in you having a lot of vibration unless that wheel is bent as I've described
I'd suggest that checking the wheel for out of round and tyres for out of round would be the next step, as shown here
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