Grey Ghost

If you want float neutrality you match the float weight up with your shot weight. Remember that different manufacturers of shot use similar numbering but the weights can be different. With the Raven shot neutral shot weight can be achieved by putting 12 - 14 BBs (12 * .40grams = 4.8 grams). If you switch to Water Gremlin shot the BB shot weighs .56 grams and 12 shots would sink your float.

You can reduce the weight to create a higher float profile in the water (visibility). Neutral bouancy reduces the pressure the fish feels from the float though, so if you are using a larger float it can result in fish dropping the bait.

Shotting pattern refers to the placement of shot on the line to affect the drift. If the water is slow and clear you may want to group your shot closer to the float to lengthen the free line. You can use different combinations of the weights with a couple of larger shot closer to the float and smaller and smaller as you go down the line. This will get a quicker drop in the water but still reduce fish seeing the shot. So you could have an AAA, 2 - AB, 3 - BB, 3 - #1, and 3 - #4 (.81+1.2+1.2+.81+.34 = 4.5 gr)