Sounds very similar to my problem back-yard Shaun. There is a new 2 story house to my NW that I would like to put a bomb under and an enormous cypress pine to the SE which is a haven for possums. It is also a total blackout for about 45 degs. of azimuth and 70 deg. alt. Other trees to the NE, my house to the west - oh shucks. need to live in some vast paddock somewhere dark.
In your situation, I would opt for a position giving me a NE outlook so that the setting sun will have a lesser effect earlier in the evenings. From a W.A. point of view this may mean more dust in the skies from inland which may be a factor which you will need to consider.
Certainly to the NE you will get to see the rising planets and to the SE, Crux etc., so I still think that might be the best position to adopt. Can all that be incorporated in your choice of site? Otherwise you may have to build a tower.
Robert
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