Try running your current shock to the max preload and ride it awhile. How does it compare to your current setting? How much static sag does your bike have with the current settings?
If money is no object and you want superior performance Wilbers makes a great product:
Fine-tune your ride with Wilbers Adjustline suspension. Offering customizable settings for rebound & compression damping and preload, Adjustline products cater to your unique riding style and conditions.