R.S.C.: I don't fish cutplugs off the downrigger 'cause I don't have any stinkin' downriggers on my little 14 ft fiberglass tub. <img src=icon_smile_big.gif border=0 align=middle>
hahaha. But that's not to say I never will.
Generally I fish the Trap Shack to O'brian Pt. mostly, I motor mooch by dropping the bait down to 75 ft or bottom, whichever is less. Bottom is about 50 ft in Trap Shack Bay around the walls, point to point (except for that reef, of course.) Strength of tide will dictate my weight of choice (normally 6 to 12 oz.), I'm starting to really like those ball weights that you thread the line through, far less drag. By motor mooching, I'll put the boat in gear, as slow as it needs to rotate the bait, until the line rises to just around a 30 degree angle and then take it out of gear and drop down to about an 80 degree angle. The weight dropping is enough speed to generate rotation on your bait and then it will speed up a little after you slip it into gear. At the Trap, this means you are fishing multiple depths of 20 to 45 ft (assuming bottoms at 50 ft.) With the two rods, with different weights, say one 8 oz and one 12 oz, you can actually have your bait moving at two different speeds up and down the water column. The only thing you have to be careful of is letting your line go verticle, a recipe for a tangled mess. But if you monitor by your heaviest line, you shouldn't have any problems.
As for pulling a cut plug on a downrigger, be sure to brine your bait really well, most boats that do have downriggers available tend to like to travel a lot faster than I do, 2.5 - 3.5 mph, maybe more, and the bait tends to rip sooner at the higher speeds. As for depth, in Sooke, in summer, generally speaking the top 75 ft. of water is the fish column, although the trend this summer seemed to be a little deeper and there were a lot of reports coming of good fish at 90 - 125 ft.
Hope this helps,
George
Seafood, it eat, then catch more.