You have an airflo 10' poly sink tip meant to attach to your floater, and it is an 8 weight. On the package it suggest what tippet to use and how to tie it to the sink leader. It should say to use 8-24 lb. tippet for best results. You can loop to loop/surgeon/ etc. Do you still have the package? If not you might find information on their web site ??? Anywhoo....I attach it directly to fly line with loop to loop, I use 8-12 lb. tippet most of the time, and I run no more than 6 feet....3-6 feet. The other option is to fish without the poly sinker and lengthen you leader to 12 feet from the typical 8-9 feet and throw some weighted flies....just experiment a little and find what you like. Now, regarding Salmo g response. Yeah poly leaders are not the greatest things, I use mine due to certain reason. They compare nowhere close to casting a sink tip line (ST3). And I usually have a butt section of 12-18" and tie 3-6 feet of 8-12 pound tippet...much better for tossing esl's. And no...I do not use furled leaders with any of this!