I have been playing Saxophone for a decent amount of time and would say I have a relatively full sound all over the Tenor Sax's range. However, if I begin to blow starting on any note below low F# (it seems to me, any note involving the F key) the tone begins at the octave above and, with an adjustment of my mouth, cracks down the octave. With some extremely careful concentration and extremely slow attack on the note -or a tongue slap- I can sometimes avoid this but it is just massively more difficult than landing the F#. Is this poor technique? It seems that extremely precise technique can make the issue less noticeable but should it be this hard?