Learner,
Been following your posts..and,
If your still useing the 8wt sink tip ,Well then chances of getting the light feathery presentation your going to need, for such close quarters work, is virtually nill.
For the kind of fishing your talking of you'll need a pretty light rod perhaps a 2wt. maybe 7 or 8 ft. long so you might still have a good chance of dapping,yet be able to cast in what sounds as though it would have to be pretty tight cover in and around such a stream.
I think the investment in a 3-4 wt. rod would be just the ticket for what your trying to accomplish,and a double taper (Floating) line for stealth, Is pretty hard to beat...glad to hear your still hang'in in there.
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"I've often wondered why it is that so many anglers spend so much money on,and pay so much attention to.the details on the wrong end of the fly line.If they took as much care in selecting or tying their flies as they did in the selection of the reel and rod,They might be able to gain the real extra edge that makes it possible to fool a fish that has,in fact,seen it all before" A.K.Best
"Wish ya great fishing"
Wish ya great fishing,Bill