RE: New Giant GP Super Sportster!!!!!
The spoilerons will help kill lift, but not so much in the way of speed? Slightly reflexed ailerons will actually increase top speed in many cases?
Regarding the GSS, before getting too carried away with other solutions, I think you owe it to yourself to try moving the CG back. I think most will agree afterward that it's an extremely effective method of controlling exactly what needs to happen for this airframe on final - without noticably affecting it's low speed handling. The plans reccommended forward CG is VERY conservative and after a lot of messing with this, I've found it a major contributer to the "floats forever" syndrome with this plane (or any other nose heavy plane).
To illustrate, I can do a stall turn in the area where I sould be turning base to final, and land normally after coming down out of it. With a 6p prop on a properly idled engine, the plane is capable of stopping NOW...... FWIW