either the strength of the reeds is too strong or you need to like sort of break them in I had the same problem with my clarinet and sax I played on 2 1/2 then went to 3 1/2 and I just had to use the reeds for a while and now they sound just fine hope it helps
Manufacturers say that their reeds play great right out of the box - they lie! The reeds need to be sanded down using 400-600 grit sand paper. There is some instruction required on how to do this. If you are interested, please respond.