Hiya Fluke,
On the circle hook knots, I have been using them for about two years now and have tried a number of knots. I have not noticed much difference between a straight 'tight' knot, a flemish eye 'loose' knot and a snell that comes through the front or back?
The most common way is a snell knot with the line through the front, opposite to what I have posted. I have since started doing it that way...if only to stop folks from asking, "should your snood come out the front of the circle" LoL
I like an off-set hook, but many folks say it's not needed. I just feel more confident this way and a confident angler catches more fish!
I don't believe that making a circle hook off-set will cause a massive increase in gut hook-ups or change the action of the hook away from doing what a circle hook does best.