Hm. Sometimes school pianos aren't kept regulated and tuned particularly well, but reserve judgement till you play a B - the 7 footer. I have played several and they generally had very responsive actions. One thing to note might be that Steinway builds their own actions to my knowledge, while many of the *upper end* pianos have their actions built by Renner, to their own specifications. This might cause the action to be *different*, but not worse, or necessarily stiffer.
If you just happen to like a lighter action, which lots of folks do, the Sauter, Bluthner camps might be for you!