Hi Laff77 and others,
I usually sail at Umina Beach if it is a Southerly of any description, but try to avoid a high tide as it is a bit lumpy in spots, but not unsailable. Just keep out of the main channel and you should be OK. Mid-tides are normally pretty good or even low tides but you have to watch out for the numerous sandbars that can claim a scalp or two especially at the low low tides.
I did use the back mast position for the first sail and found it really suitable. Gybes were not a problem and when I get more confident on it I will try some serious cutbacks like in the impressive video. Well done. I want to do that on my Fly 10'.
I didn't use my 5.3 wave sail as I thought it wasn't windy enough to try it and was very happy with the 5.9 but will give it a go next time. Had no problems with the 5.9, it was very manageable. Used the harness though.
The best thing about the afternoon was that I was the only one out so I had it all to myself. The kiters could not even get going on their modified surfboards.