And i have buzzers with a hackle which i suppose you could say were spiders , i think some buzzers/spiders are very alike 
methinks you might be right
I fish various spiders and they are often presented to people as the way forward, unfortunatley the way back is sometimes they way forward ,therefore people dont understand
But a Waterhen bloa fished on a floater and a long leader is as good a fly as any you will try
(dark, light or blue
)
I would add a black spider tied with a starling hackle, a black peacock and plover, a partridge and peacock and a greenwell spider to the list and then have a selection of flies which i could fish any where on any type of line and have confidence in my ability to catch fish. Of course i would also have a few red hooks with tungsten beads as a back up (because they catch everywhere all the time , so its not fair to use them
) Still
Fish them upstream, downstream, short line, long line, slowly, fast, fo8 whatever you like, to make them behave however you like, depending on what the fish might like.
One only hopes this is partially coherent, as two bottles of tullibardine whisky beer, the remains of a bottle of talisker and the start of a a bottle of Quintan ruban may have affected my ability to speak, if not to type
.
Sandy
