Re: My alto plays a whole tone too high
My guess is that it is actually 1/2 step flat, and that you want to push the mouthpiece further onto the horn.
You're used to the flute, which is an instrument in the key of C, and the notes match those on the piano. The Alto Sax is keyed to Eb, so a C sounds like an Eb. The A should sound like a C, a G should sound like a Bb.
That's my guess.