Does anyone know about old racing boots?

Got these racing boots as hand me downs and wanted to use them for regular resort skiing but they are super angled and stiff, I took this shim out of one of them and it made it so it has a little more flex, is that ok? Any advice would be appreciated. Thanks!

Got these racing boots as hand me downs and wanted to use them for regular resort skiing but they are super angled and stiff, I took this shim out of one of them and it made it so it has a little more flex, is that ok? Any advice would be appreciated. Thanks!