I also have been getting ear infections, i just have to stop diving when i get one but they normally go away after 3 days.
Its the opposite at my spots down torquay bass but no mullet!.
Matt - I don't normally get ear infections in the Uk - but I get one almost witout fail when in warmer waters. The guys I know that spearfish regularly in the med often do two things: pour olive oil in their ears to help soften any crusty wax and make sure there is a good barrier against bugs(honest) and then second when you get out you can pour a watered down solution of white wine vinegar to clean out any muck that has got in (this is alot cheaper and almost identical to some spray on stuff called ear calm that I started using until my doctor told me about the white wine vinegar.)
Finally there are these vented ear plugs called proplugs which are designed for use in diving/surfing etc. Now I know you are not meant to put things in your ears when you dive - but these vented ones are designed for diving - they simply stop the sea water from washing away your protective waxes - which is when the bugs living in the ear or introduced by the sea, attack the outer ear canal. The other good thing about the plugs is that some people get a vertigo like symptom and pain when really cold water hits the ear drum - the plugs stop that too. Might not be for everyone but I use them in warm water - when I remember...