just some thoughts to be thrown in:
- some of my students have synchronized a deep head/body (one or both sides) with a little overrotation and a recovery elbow behind their scapular planes (And added tension to reaqch for air and not to let it come in...). Have a look in ZT's thread "Never leave the scapular plane") and watch yourself...
- Mat's hint: Imagine you're lying on thin surface of ice and wan't break through while stroking and getting forward.
- As in my own case it might be a little too deep spear. Go back to skate and look if you're left-right-symmetric and have in mind your hand's position as targets for spear.
- Play around with your breathing patterns with some more weight to your weak side. R-R-L-R-R-L... or similar for strokes or laps. If air gets lean try to get more often air on your weak side or just breath only on your weak side for some minutes.