Where are you measuring ride height? Be sure you follow how the manual tells you to to measure.
Leave it stock - i hammer the crap out of mine and it' still great / no sagging...if my springs sag I'm putting back on stock, i would not pay more money for it to ride better because I can't imagine it can get any better - or not worth the money if it did. I wish CanAm would advertise the spring rates, but they do not - then buying aftermarket would be more doable. I look forward to meeting people who spend a lot of $ on aftermarket and doing a comparison. Maybe in 2020 they changed things up, because my car performs great.