[ollykiwi3]

Pretty sure I have figured this thing out.
Because I never had return springs on the handbrake lever arms I was ways having to adjust the handbrake caliber and couldn't figure why it was always wearing.
I got some springs and attached them to the chassis.
I figured it was just g forces going around corners that was wearing them out, But what it was also doing was transferring handbrake pad material which was softer onto the disc making it seem even stickier and that was causing the brakes to chatter at low speed. Too grippy with not enough load.
It's been about a year now and have only heard it chatter a couple times in the early days but nothing for a long time now.
Hope this is of some help to others.
Thanks for the thoughts during this time.