I've settled on an 8.5ft RPL 5wt for all-around duty. Not too long, not too short. The 5wt is nice for our trout although keep a sharp eye out on those rivers for searun trout, I've seen them with me own eyes and have friends from the area who've done well although inconsistently over the years. I used to fish those areas in the early 80's due to the experimental coho salmon years.
Also include the Indian Head River in Pembroke and Hanover, a tributary of the North River, which is a nice venue in cool months.
I don't feel it's a hindrance on ponds once lined with a proper line. A DT would not be the first choice on ponds as you know, something you can shoot would be much better for the task and the trout ponds from Plymouth south onto the cape are spectacular.
Drop me a PM
IFFF Certified THCI @ 2005
Capeflyfisher Guide Service
Island Hopper, Guitarist, Incurable Dreamer
and Founder, Worldwide Flyfishing Forum