E93 High Speed Stability

Fitted new rear tyres to my 2008 E93 330i (front tyres are ContiSport 5 with about 4mm left) last week and drove the car carefully (less than 50mph) for about 80 miles.

Then I took it out on the motorway and after about 80mph the car feels very nervous, as if it wants to oversteer!!!

I had a 4 wheel aligment done on Friday and the front and rear wheels were out, but they aligned it correctly but still no better on the high speed stability.

The new tyres are Kumho Ecsta Le Sport and are 265/30 19. Before I had Michelin PS2's @ 255/35 19 and they were fine at low and high speeds.

Is the issue due to the fact that I have used 10mm wider width? Or is it just down to the tyre brand and model?

I'm happy to swap the tyres for a decent set of Michelins or Goodyear Eagle F1's if that helps.

Thanks in advance.

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E93 High Speed Stability