I have cast the LS2 1509 quit a bit with many lines but not the SA tri-tip. The lines I like for the rod are the 8/9 Midspey, 8/9 grandspey 9/10/11 windcutter all by Rio and the SA 8/9 XLT and SA 8/9 spey mid. All work well for me on the rod but the stand-outs are the Rio midspey and the XLT. I hope this info helps.
I believe that the SA tri-tip has the same taper as the original Mastery spey, unless they have updated it. That line has a 15-20' front taper (I've measured 2 of the lines, Mastery 8/9 and 10/11) followed by a long section of level line then to running line. Basically not much of a taper at all. Predictable yet uninspiring turnover.
A forum community dedicated to Spey casting, fishing, flies, and enthusiasts. Come join the discussion about trails, licenses, fishing, game laws, styles, reviews, optics, accessories, classifieds, and more!