Hi PP: I dont have a TT9/10 but I do have a 7/8,a 10/11 and a 11/12. On the advice of my rod builder I have cut each of my tt`s at 15' for use with airflo salmon tips of 10' extra fast sink, and have made a second cut leaving 30 ' of butt section for use with deepwater express heads of 10,15'and 20' cut from 550 grain DE or 850 gr . I find that the lines also cast well in the wind with the 15' tip removed.