Problem with new Quantum shoes

[123456]

Hello,
excuse my very very bad english, please!

I have got an old Quantum shoes 01 size US 7. This shoes are very good for me, but now are already worn out. I bought a new Quantum 03 with size US 8, because Quantum 03 US7 are small for me. Quantum 03 with size US 8 are almost the same as Quantum 01 size US 7. Looks nearly the same size and insoles are the same size.

But, when I played with this new shoes today for the first time, do not fit me very well. Plays with me sick. The foot moves me a little. Especially when a greater impact.

It will get better over time? Is it just a habit? Or need different shoes? But Quantum 03 US7 are tight for me.

In Quantum 03 I have insole "Spenco polysorb proform", in quantum 01 I have original insole (much destroyed and worn-out). It may be insole in shoes?

What can I do? I'm unhappy. I do not want to ruin foot with wrong shoes.

Thanks for any advice and help.

[F[uns]tylin' Eclectic]

I heard that the Quantum 1's and Quantums 3's sizes run differently. Other than that, I dont know what to tell you :/ Good luck.