A pair of 30″ socks on Brad’s 1890 tiller with a 90 HP motor slowed us down from 2+ mph to under 1 MPH at idle. What do you have for a motor? I would assume you’ve got a 150 on there. If that’s the case I would step up to the next size larger.
This is from the Drift Control site:
“If you’ve you ever trolled in the wind, you know how frustrating it can be. The bow of your boat blows off line, forcing you to speed up to get back on line. Take your eye off the bow for one second, and it happens again. Sound familiar? Cross winds, head winds and waves will wear you out— but there is something you can do to get back under control.
Recently we at Tamer began testing a new trolling technique using two Wave Tamers to stabilize the bow. For small boats and engines 100 hp and smaller, we recommend two 30″ Wave Tamers. For larger boats and engines above 100 hp, we recommend two 40″ Wave Tamers.”
So I would think a pair of 40’s would be the right set up for your boat.
Here’s the link to those >>>
http://lindylittlejoe.com/fishing_tips/drift_control_tips/trolling_drift_bags.shtml