I think you may have white. spring I was asking about, too stiff. The red torque spring, although maybe not as stiff as white, has the same issue, too stiff. To my knowledge, red sping is generally for racing applications, will not give you good results.
The Malossi torque springs for Kymco in order of stiffness, weakest to strongest: green, purple, OEM Kymco, blue. A lot of people get purple torque spring, for 49cc engines, I like green best.
Do you have a good understanding how CVT works? If not, there is a lot of good info available about it. If you have the time, do some research and reading on CVT. CVT is key to getting your scooter to run fast IMO. Basically, a well tuned CVT will have your engine working near max HP/ torque from stop to approx 40/ 45mph, then the engine will continue to gain rev's for more spreed. If your engine is loafing along until it hits powerband and then scooter takes off, your CVT is not optimized. Cheers