Drift Sock

[thunderbayeye]

I have an alumacraft classic 165 with a yamaha 50 fourstroke. I would like to get a drift sock that I can use for both boat control while drifting as wells as slowing the boat down while trolling. Now the boat will troll down to around 2.0 mph on my GPS i would like to try to slow it down to around 1.2 so i can pull spinners. Can anyone give me an idea of what size i should get. After reading reviews on Cabelas it seams like I would need to get at least on size bigger than is recomended in their chart. Also what is the best way to rig them while trolling i would think off the front of the boat so it runs underneath the boat.