Hi Jean-Jaques,
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.
Greg