My money is on shit tyres. What are they?
Pedders coilovers arent harder than some jap spec ones. So Im declined to blame that.
My mates 32 had a problem with spinning around spontaneously, but his hicas light was intermittently on. So we blamed that.
But for you, Get some better tyres. Or go and do a defensive driving course, as you will hurt yourself or worse others. You need to learn to drive that thing.
Do you accelerate out of the roundabout when this spin around occurs?