Re: speed vs acceleration... not satisfied
When you say cvt I think you're referring to a TAV...if so ,on the driven unit the spring can be moved to another hole to either delay the opening of it(to top end) or speed it up.
That and careful sprocket choices should get you closer to what you wanna do.
Your hp may be limiting you at 3.5, the tav uses up some of it. The cvt on scooters is smaller and robs less on those peanut engines. Still not really wonders though.