kpk: have you tried in the water but going feet first?
If your nose "blows up", you are propably doing at least something quite right. Then the problem sounds like you etubes are just too tight when in inverted position. In that case you might want to play around with changing the position and in the end learning to control the tubes (there are some threads on hands free equalizing that should get you started. But learning to yawn on command is a good start
