i am using 0/0/6 for settings with pirahna and not much than 20/0/6 with other ships

In fact when you reduce at max the angle, you only need to master the airbrakes to find your line : twisting is just for giving an impulsion to the right or left to your ship.
Get a quick tap on an airbrake to see how pirahna reacts and then you can deduce a new way to learn pirahna's handling
Try to google into this 2097 forum about the ' airbrake technique'