Tommo...
Try wee dic nites. Not size 1 or 2 but the WEE version. Stock up in brass, half brass/half silver, and chartruese. Rig them up with a few split shot on a 3-5 foot leader and get it down to the fish and reel slow so the spoon wobles back and forth and doesnt spin. Tie the splits to a small dropper line so a fish doest part your line where the split shot was connected to the main line. Stick with the dic nites and you will catch them. They are notorious for going on the bite one hour and them not biting for another 3 or 4, so just keep casting and you'll get your fish. THis is the only setup i will use on the silvers when they are in thick, other guys will catch an occasional fish but not consistently like the d'nites. Also get a few tiny hot shots and rig them up the same way.

fish on...
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"I have a fair idea of what to expect from the river, and usually, because I fish it that way, the river gives me approximately what I expect of it. But sooner or later something always comes up to change the set of my ways..."
- Roderick Haig-Brown