Too much rainwater can spoil your sport on some waters Mick , it can colour the water up to a muddy brown , not ideal for fly fishing where the trout have to be able to see the fly !
Buzzers can be fished just like your lures , just slower !
I use 3 , 4, or 5lb Ashima for my leaders when I'm buzzer fishing , 3lb in crystal clear water 5lb in peaty coloured water. I tie it direct to the loop on the end of my fly line and have about ten feet to the first buzzer , then 4ft to the next one and another 2ft to the point fly.
If you are worried about casting such a long leader , shorten each section but keep the two flies at the end closer together than the top dropper fly , it helps with casting. Or you can just fish 2 buzzers or even one on the end of a ten ft leader , they all catch fish !
Cast the whole lot out and pull the line back till it's straight , then as slowly as you can bring the flies back to you and start all over again. If there's a decent breeze and the line is drifting with the wind , don't retrieve at all , just straighten everything up and keep it tight letting the wind move the flies.
Indicators will catch you loads more fish on certain days , this time of year though the fish are active and looking for food so you won't need one.
Trout tend to swim around at different depths depending on the weather and water conditions , once you find the depth they are swimming at on any given day you can use an indicator to set the flies to fish at that depth.
Fishing three buzzers on a leader effectively has you fishing at three different depths , the point fly being the deepest (if one of your buzzers is heavier or bigger than the others put it on the point)
I use 6 or 8lb leaders for lures , it dosn't matter about the thickness of the leader when pulling a lure , but a tiny buzzer needs to be fished on a finer tippet , this lets it "drift" around in the water more naturally than thicker lines do.
Have a go with buzzers Mick , but if you fail to catch don't give up on them , go back to lures for an hour or so and then switch back to buzzers , sooner or later you will coincide with a buzzer hatch and a feeding frenzie .......and you'll love it
Ray.