Hi,
Were your new Tires Dynamically Balanced? There can be some great discrepancies between new tires and only by using a Hunter Dynamic Balancer (97XX Series is most current I believe) can you be sure that the Tires are within spec (they all are not or cannot be properly matched with their Mate).
If this was done, start thinking about alignment or possibly a bent suspension member (these are Alloy and can be bent from a PotHole, Speed Bump or hitting a curb, albeit lightly, sufficient that they introduce a shimmy such as you describe). Hope this helps...
Happy Motoring!... Jim'99
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