Fair point, I have two integrated lines for 7wts that remove some of that clunk when I need.What about an OPST smooth? Its an integrated line and can be cast overhead. I use a rio costal quickshooter, but doesn't come in a 4 wt. 5 is the smallest.
I fish this in 5wt in the lakes. It casts really well but being S5 it's very skinny and tangles a lot when it's cold. Thicker intermediate might reduce the tangling.SONAR Stillwater Seamless Density Fly Line | Scientific Anglers
The SONAR Stillwater Seamless Density lines are a unique departure from the traditional graduated density lines of years past.www.scientificanglers.com
I have used this for the last year.