I did some practice laps with the MX5 on Bathurst for the Wednesday event and after that I did a few laps the GT4 there.
What you are saying about the learning opportunity from the Maserati for braking, that goes for the Cayman for tyre management. I was really burning the front tyres on Bathurst in the middle sector at first. Wouldn't have finished the race without tyre change that way. I tried some different approaches and without losing (much) pace the wear decreased dramatically.
I've never seen this effect so strong with other cars. So I think that both GT4's are very good cars for optimizing your drive style on these aspects.
I'll stick to the Porsche now for the same reason as you stay with the Maserati. Later I will switch to that car to improve my braking!
I'm grateful to Brian that he added the GT4 class to the Sunday events.
The tyres seem alot more forgiving than the GT3 softs, after a spin or drift you don't get a big overheat issue to deal with. It would be similar to doing a no tyre change GT3 race on mediums. Behave in a similar way but a bit easier to keep the heat/grip in the GT4 tyres.