Apologies for the huge delay, I wasn't in the country after my previous post.
I disconnected the HKS turbo time on Sunday(has the wiring harness so just unplugged that), went for a quick drive and the issue didn't appear. Was heaps happy until the next day when I was driving back from work the HICAS "kick" showed it's ugly head again.
Now it doesn't matter whether I connect or disconnect the turbo timer, the HICAS light/kick in steering/noise from boot occurs randomly. I'm thinking perhaps it's the HICAS computer or some sort of electrical problem (I haven't done the HICAS diagnosis yet, will do on the weekend).
Also when I start the car I can hear about 4-5 clicks coming from the boot (HICAS pump?).