I fish the Youghiogeny River in SW Pa for smallmouth. There are plenty of 6-10 foot deep runs that I just can't touch with a 1/36oz Clouser and a floating line. So the need for sinking line becomes obvious. But......which sink rate am I after?

A guide on the river highly recommended this one:
Scientific Anglers Mastery Uniform Sink Plus II

So I see it's a type II, rated at 2-3" per second. I was thinking I very likely needed a faster sinking line, though his advice is probably pretty good. My reason to question it....I'd be waiting 4-6 seconds per foot of drop, water's 6' deep, I'm half a minute into waiting for the fly to hit the 6' mark. Seems too long?

To those of you fishing sinking lines in smallie rivers, which ones and why?