Shep
I have caught fish in all different types of water. One of the hardest things to mastering steelhead fishing is reading the water. Until you know which water screams cast here, fish it all!! This is the best way to learn.
It sounds like your jig is heavy enough, but it shouldn't be leaning while your fishing(or only slightly). Make sure your line is not causing drag on the float, pulling it faster than the current. If that doesn't fix it add some split shot to stand that float upright. Having the float upright helps keep your line off the water.

As far as using a lighter jig... go lighter when water is low and clear. Heavy jigs for faster water.....keep it simple. I usually use a 1/4 - 3/8 oz in winter fishing conditions.
Keep those hooks sharp and keep casting!!!

Tight lines

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Marty
www.steelheader.net
marty@steelheader.net