Changed to non run flats

[DashBedrock]

I've just replaced my Bridgestone RF's for Michelin pilot sport 4's and was initially very happy with the improvement in handling.
But I've just had a run on the motorway at speed and the front end feels very twitchy.
Do I need to have the wheel alignment adjusted? Or can anyone advise on possible cause of this.
It tramlined on the RF's but this is totally different and is just as unpleasant if not more so.
Up to speeds of say 50 there's no issue, but at 70, Oh dear!!!
Thanks

[hopz121]

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