Check out the rio t-8 sinking tips. It'll save you from having to get a new spool and they cast pretty nice. I actually used them with huge streamers on a trip to the farmington last year in really high water conditions after a big rain and they cast pretty nice. We used them on 6 wt's, but i'm sure your 9.5 foot tfo will handle it nicely.
They are 30 foot and have a pretty fast sink rate. Something like 7 inches a second.