Chris,
I take you took these from Kellyville? Your real problem is light polution, 5mins and you are getting washed out with city glow, way too long an exposure.
I wouldnt do anything longer than 2mins for an un-flocked 8" newt and 3mins for a flocked 8" newt.
That is all I could do from my Sydney back yard with an 8" newt and a Canon 1000d.
What you really need is a dark site!
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