Oh yestam me tinks you should keep playing in your yacht, you sound like a very old pilot if things in the real world seem a bit scary at times. You see all this !!!!! you describe is a bit too much to be really true and I tink you have no fu**in* idea of what happens at BH but your little ego trip wiil be in your mind only so come see for yourself oh I forgot you are judge and jury.
Sky diving has not been happening for a couple of years at BH (dropping there that is) so point 1 of your story shot down, trikes all use radio so point 2 shot down, a low flying trike is known around the traps but not originating from BH so point 3 shot down, a/c from the other side of the bay visit this area you know so get onto there case as it is a good chance they are the ones you see.
Tigers low ,if you know them then why so late in reporting? oh I forgot you are now a liitle peeved so you will give em a 225 if your 500ft. judgement is any good. We do not need to prove anything this way as you would know if you care to contact CASA you will see a bloody lot of reports about certain bad airmanship from visitors like you who leave the confines of regulated fields and think you can do what you like at small dromes, well son we do not need you here under your present mind but if you get a fit of saneness come on down the offer still stands and believe it or not you will be welcomed. (rant over)