I have had great success adjusting pH in my ales below 5.4 - the actual ale before I pitch the yeast tends to be crystal clear and any chill haze disappears within about a week. My calculations with Brewer's Friend which up to this point have been quite accurate, suggest I need close to the equivalent of 5% just to get to 5.4, and I have heard that Pilsners are prone to haze.
Apart from that, thanks a heap for all the great advice - single infusion is so much easier!
As I said, I am starting really simple, but if any JW haters are watching be warned I will be sharing a few bottles with Czech beer lovers without any warnings. I accept that I will probably be trying a more "authentic" Pilsner malt in the future, but I don't understand why some are so anti-JW. I wouldn't want to go work for them, as Tassie is just too bloody cold for me, but it is still very much a part of Australia - the best bloody Country on Earth!