Why the hæll would a patroll boat need a range of 3000nm?!
Take a look at how big Australia is, and how far there is in between the major harbours.
Anyway, range, endurance and seakeeping are the main parameters for a patrolboat. Everything else can be sacrificed to gain those.
Secondary to those are cost. Since they spend far more time at sea than their more warlike brethren, patrolboats have to be cheap to operate.
That's why you see 3500t ships armed with nothing more than a 76mm gun and a handful of HMG/LMGs.
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