Well yo
u are lucky with the water in that you get a fantastic report from your water company.
Wellington water report is very limited.
I just use sodium metabisulphite, 0.3mg in the mash water and 0.2mg in the sparge.
I use fermentasaurus most of the time so can drop the yeast and trub out with that.
For my barley wines and brett beers done in an airlocked fermenter I just siphon off the top into the bottles.
Dry yeast won't be your problem then, unless you are really stressing it ie underpitch, swings of temp.
I've built up quite a yeast bank now so the starters and yeast just cost the malt extract really.
What does the beer taste like before you bottle it?