Hmm. Not easy conditions to find success in!
My tips for super bright, glassy conditions:
1 - Avoid wading at all costs. You don’t want to alert the fish. This is where your well practised, longer cast comes into play.
Wittle Wabbit Tan
Cut Cat Lurex
2 - Fish smaller, more natural patterns with loads of built in movement as you won’t want to strip too fast / long. Wittle Wabbits, Cut Cat’s and smaller, softer matuka patterns fished on longer, lighter tippet on separate droppers in teams would be my go to.
3 - Fish a Airflo Clear Camo intermediate line so that it disappears into the surrounds and surface disturbance on the retrieve is minimised.
4 - Make your cast and then wait. Chances are the drop of your line may have spooked any fish in the vicinity, so let the water settle and give new fish a chance to move into range. Maintain contact with your flies however as your line slips through the column - some fish may be attracted to the drop.
5 - Make your retrieve with rod tip in the water to avoid tiny vibrations / disturbances across the surface with every pull. Employ a slow, smooth retrieve as fish are more likely to hit a static, or slow moving fly in glassy conditions.
And finally, remember your sun protection. Even though it’s still only September, the sun will still getcha!