where"s a good spot to sail in the winter around perth area , iam sure there is a lot of good spots undiscovered

unfortunately mate I think you know them all already!
basically:
-Dutchies on a NW or SW (the best ever wave sessions at Dutchies are in winter)
-Crazy waves for all the W, WNW winds (and you need at least 1-1.5m at Cott buoy to have a fun wave there).

And then further south: Rockingham(Long Point,
Point Peron) for NW and WNW, and Mandurah for WSW and SW.

I always though too that they should be undiscovered spots, but there isn't really

any of the northern reefs 2kms out on a nice sunny strong easterly with a big winter swell, for some D.T.L action..........

i was sitting on the dog beach, watching the A frames this morning thinking how good it would be............ if i had a spare $100k for a nice big boat for trips out to the action.

You guys are so lucky to live in WA or QLD, I went out the other day in Port Phillip bay and froze my balls off!
Melbourne is horrible in the winter, not much wind and cold as.