Three weeks ago I was flying my SPAD Debonair off the water with a TT Pro 46. Zero Right Thrust, Zero Down Thrust, Zero Problems on take off. Well designed floats and an appropriate water rudder can really help keep the plane straight during your takeoff run. Check out the Seaplanes forum. And if you're anything like me, and your prop is just slightly too long, it might hit the water occassionally and actually drive the plane more to the right!

If you re-read the article in MA, it describes what conditions you would observe that right thrust might correct. Don't add right thrust unless the design calls for it until after you've had a chance to test fly.

Good Luck!
Brad