I have a few questions on float fishing concerning summer steelhead.

When fishing a baited jig under a float, should the jig be off the bottom, or should it be contacting the bottom.

From my experience, summer fish tend to be holding more in the riffles, How should I rig my float in this situation?

When rigging for jig fishing , should I put split shot above my leader, If so how far?

One more question on summer fishing, Is it more important to be out first and last light or does it matter? I know winter fishing
I caught them all different times of the day.

Any information would be appreciated. Thanks.