I know 100% you are within your legal rights to record when a cops pulls you over. Also if a cop refuses to show his badge you can pretty much tell them to f**k off and leave lol. As for getting pulled over it's all about attitude and the way you drive. Also the time of day. If you are out past midnight cops are going to be tired of catching idiots out on the road, they are tired and want to go home. They will have a shorter fuse, so be polite and hope for a good one.
The sad thing is 99% of cars in Australia can be defected for some reason or another. If a cop is defecting you for ride height or noise chances are you can be defected for something else. How many of us are running in cabin boost controllers? At the end of the day if you get defected for stupid reasons keep your mouth shut and hope that they don't go into more depth and find other things.
And considering technically coilover suspension requires an engineers cert. Consider a standard defect lucky lol.