We've never been on a 4'11", so I don't know if that plan shape impacts the fin pod or not. The Scim's by themselves are pretty drivey, but the smaller C-5's as the canards aid with drive. The TW-1's have no rake and their crazy deep, what I remember from that, was the drive decreased - the TW-1's tried to take over, so it was like having just the canards as your rail fin. Also, the board was exceptionally grabby on bottom turns. I can remember that the tail felt sluggish, like a really poor quad.
Removing the TW-1's no doubt would give better drive, just not as effective as with the C-5's.
All of my opinion is based on the 4'5" board. We had a 4'7" that felt like it was a bit sluggish, so I'm wondering if exploding the plan shape has an impact on performance with that fin pod.