I was thinking about the Waddington thing. They have some great advantages, hook set back, slim profile and so on. I think the tube might be a little more versatile, different weight tubes, easy to change hook size and style. That is the reason I went with the tube first. I have some Waddington shanks I will have to try next.
As for getting them in the cold weather, I agree with you and your friend John from Grindstone (your comments on the other post). Once the fish get used to the cold water they react the same to a fly as they would in warmer water. They need to eat and they will chase and grab a swinging fly. They just do it a lot slower and we need to take that into account.