.02 cents here only.

I'm not a sink tip fan by any stretch of the immagination. But getting deep down and dirty as they would say is a must under given conditions.

What I 'do' is take a full dry line and a 2-3 foot section of 'butt section' (and your leader is probably already set up this way anyway) and put a loop in the end.

Here I attach either a RIO or Airflo sinking leader/tippet/fly. The above system would seem improbable, hinge like hell, etc., but it dosen't. The 2-3 of butt acts "disconnects" the dry line from the sinking leader and allow it to get down, and NOW. If you're using a weighted fly, even faster.

You can also use T-14 for the same system bennie of this is it's very thin so water flow doesn't push it to the surface anywhere as fast as you'd get with a 'standard' sink tip.

A good thing.
fae