I picked up a Nextcast WA 55' head for use with my 8152-4 Burkheimer. I am planning to use this setup in a couple of weeks on the Skeena. A friend suggested I use a 15' Type 6 tip for six weight (85 gr.). Recognizing that depth/flow and fly selection are factors, does this sound like the right tip weight for good distance and turnover on long slow swings? I'll probably be using unweighted tubes in size 4 a good deal of the time.