I'd favour getting a Mulitimeter, (and someone that has the know-how to use it if you don't) to check the sinks for "liveness" rather than deliberately shorting it out.
The fact the mosfets have mica shims doesn't mean the sink is not live. The mosfets in the enermax were all shimmed but the sinks were live. I could find no definite reason why they needed to be live. Now the sinks are not there, and the block in the PSU is earthed with the mosfets attached to it also fully isolated with the same mica shims without any obvious downside. more about this in the PSU cooling build on my site.
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