Oh, I shouldn't get into this... 
The 'lag' is likely due to improper jetting.
S F
You can 'tune' the rate of lift (or call it timing of lift) of the CV slide by modifying the lift hole and using different strength springs. With enough experimentation you can make it do anything you want. (You'll end up buying several slide assemblies and springs before you're done). Probably not needed for a stock engine where you've only removed the air box and piped it though.
The right way to do it is to tune the total intake length (center of intake valve to velocity stack / carb inlet) to the RPM you want the best efficiency. You have to consider space limitations so you probably can not catch the ideal sonic wave.
The 'lag' is likely due to improper jetting.
S F