Steve, for BM I fish 4 or 5" (5" primarily) Tomic or Silver Horde plugs. I stick with mostly white and mother of pearl colors, although the past year I've done well with the "cop car " plug from Silver Horde. If fishing Silver Hordes, I remove the treble hooks as they make releasing shakers very difficult. I add a tru turn hook instead and have very good hooking success. The Tomics come with a single hook. I usually remove the hard wire from the Tomics so that the line then goes through the plug body like with Silver Hordes. This way if your line breaks, the plug will float to the surface. I very seldom lose plugs this way. You don't want to lose a good plug. Only about 1 in 6 or 8 I purchase really work great. I always fish the plug plain and at least 50' behind my downrigger release. I don't use a swivel to connect the plug but tie directly to the plug. Plugs should be fished at a good speed but you don't need to fly. You can go to the Tomic website and they have a great information page on how to rig and fish plugs with good photo's. Here's the address: http://www.tomiclures.com/rigging_instructions.htm
Whatever you do when you get a good one guard it with your life. I have a couple of plugs that look like a grinder has been working on them and they catch fish.