Hey there... my two cents... (lol... that should be five cents worth, we phased two cent coins out years ago...)

Bouncy... I hadn't heard that technique of Ulrich's - will experiment next time I am out (that is... later today...)

What helps me with breathing is to conciously think about it... and get in a rythym that matches my pedals...

If my ride involves considerable stress (like up a hill, or in a TT), every now and again I become aware that I have started panting, so I "wrestle" with myself back to a slower rythym, and then I "huff" out a couple of times... that is, between each in-breath, I try to get rid of as much air in my lungs... its loud and sometimes messy (fine spray)... but it really helps me.

As for the dry mouth, me too - and that I attribute to me breathing in through my mouth when under 'stress'... I take a swig from my bottle, swirl it round to wet all of my mouth, spit it out, then take a little sip to coat my throat.

I also get "pursuiters cough" after rides that have been demanding due to the constant "heavy breathing", but that goes away between 12 and 72 (approx) hours.

Good luck with finding something that suits you...