So I replaced my all season tyres with summer tyres just before the cold season. Yes, I am very clever! Anyway, I noticed the tyres became so stiff, I could feel every little misperfection on the road. I thought to check the pressure as well as they looked rather pumped up. So upon checking them one tyre was at 35psi and the others at 40psi. Even a little job the garage can't do right. Will I use them again, I don't think so.
So to sum up, the all season are much softer than summer tyres. Lesson learnt.
And will get even worse once the temps drop below 7c. Out of interest why did you go from all seasons to summer (esp this time of year!). the point of all seasons is to run them all year round. With the weather we have in the UK, unless I had a performance car which i only used in summer, I would never bother with summer tyres in the UK or at least swap between summer tyres and winter/all season tyres.