Check stub axle is seated properly in the diff Stu.
Are you running the light weight (alloy) axle cos it doesn't take much to bend them.
As for the zen axle kit, i must say looks very tempting i've been looking myself, but then a little devil sitting on my shoulder reminds me that its a third the price of a zen race kit and would that be a better investment.
Going back to that though there are a few that run JFT's on there SSGT's at Maritime as apposed to contacts so i pressume they prefer them.
The other option and correct me if im wrong someone you can buy the donuts (foam tyres) mount them on contact rims and true them up on a tyre truer, or get someone to true them up for you.
Shiny
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