Great stuff George!
Halibut rig I use is very similar.
I put 3-4 ft 30# floro leader to the hook (snell and treble like yours). Logic - give that bait more space to swim freely... Give 'em more space to try to avoid that bite. No worries - if halibut decides to eat, they'll get 'em. On a longer leader, your swimming live bait ought to appear more natural to the predator.
I use 1-3 ft of a sinker line, depending on how clear the water is. Shorter if murky, longer if clear. Simple logic - if higher up above the ground and good visibility, you're covering more sand. If murky, you want to bring it down closer to them. Always a lighter line to the sinker.
Required reading for anyone looking to get serious about targeting flatties:
Great write up by Andy:
http://www.kayakfishingsupplies.com/...=kayak-halibut
Another stellar write up by Todd:
http://www.kayak4fish.com/press/Halibut0405.shtml
Now that you know how to catch them, make sure you're ready to land them
http://www.bigwatersedge.com/bwevb/s...ead.php?t=6760
Another thing worth the mention - true bounce balling is definitely very productive way to get them. With flasher and everything, I found it pretty hard on a kayak. It may be easier on a Hobie though? It's one of the reasons I'm considering getting a Hobie.
This is very valuable read from Rick Da Goose, Masters Degeree in halibut sciences:
http://www.bestofbiggame.com/BounceballTips.html