Separating the tongue and throat

This is a continuation of the open pathway thread.

I followed your advice, but now another problem had arisen.

It seems that when i try to bend with just my tongue ( my throat open, jaw dropped) I have to much space between my tongue and roof mouth.   And the bend just doesn't want to happen.   It seems that if I raise my jaw up closer to normal resting position it is much easier to bend with just the tongue.  Ofcourse not without a sacrifice in sound/tone.  Any advice in this perticular area? 

Any other advice in the vein of tone and embouchure   would be great.  I'm trying to correct all my bad Habits now before I play for years the wrong way.   Much harder to retrain yourself at that point i would imagine. 

Thanks