RS1 had a great suggestion in trying the Winston Biix. My 6 wt SLT will do anything for me, but my 4 wt is a Biix. The Z-Axis 4 wt will definitely cast the furthest. Sage stopped making the SLT before I had a chance to try it in a 4 wt and I did not like Sage's ZXL (replacement for the SLT). What sold me on the Biix 4 wt was the way it handled both long distance and the more intricate shorter distances compared to the other available 4 wt rods.