We started using Scimitars back in '07 - this is a great picture of "hairboy"
back in '08.
We switched away from the Scims to the 3/2/1's because of the extra squirt they delivered, especially in the Twinzer configuration
that James likes.. The 3/2/1's dont seem to trim as fast as the Scim's but "off the line" generated more drive. They also were better at going vertical for James, I don't go vertical unless I fall.
In our experience, in bottom turns, the 3/2/1's generated more drive, out of the turn.
When we were doing all our swapping of fins, I found the Future Fin's site did pretty good at listing the applicabple fins. I do NOT like their recommend a fin ap, but using the menu FINS/THRUSTER/MEDIUM gave a useful list of fins.
The verbiage from that site
Determine the primary surf you ride, and characteristics you want.
Mushy surf requires a fin that creates incredible amounts of drive and speed right from takeoff. Hollow surf takes a fin that controls the inherent speed of the wave. Midrange rippable surf can take a blend of both. Choose the fins in your riding style category or move one category left for a looser fin and one category to the right for a stiffer fin.
The "Mushy surf" option always worked well for our selections, YMMV.