Welcome!
You suck!

That's a killer deal! You'd pay more than that for a used 2004 in good shape. Do they have any more? (I'm completely serious.)
The main thing to understand when tuning a machine with a CVT is that you need it to make peak HP at the RPM range where the clutch holds the motor at WOT (or below if you spend a lot of time torquing around at low speed).
A lot of mods can move the peak HP to a different RPM range (usually higher RPM, it seems like). So let's say hypothetically that your clutch doesn't let the motor rev higher than 7,000 RPM. If you do a mod that adds power in the range from 7,500 to 8,500, the clutch will never let the motor rev into the range where your mods are working for you. So, you're not getting what you paid for.
(Keep in mind, those are not actual numbers, just an example.)
Obviously, on a manual quad you can compensate for a change in powerband by changing at what RPM you shift. A CVT can be tuned to shift at a different RPM by changing springs and weights. So, it can be done, but the clutch and engine
ideally should be tuned together. Most of us aren't quite that sophisticated.
Generally, it seems like with bolt-ons you don't have to worry too much about matching the clutch to the engine. It gets trickier if you start changing cams, compression, etc.