Techno

The damping shouldn't be maxed out, something's wrong. Either they've got the sims stack wrong, or it's not setup correctly. Rebound effects both compression & rebound, where as compression does just that and has a smaller effect. Depending on model it's possible you've got heigh/low speed adjustment on both. Again if incorrectly set up it's possible to max one or other out. Also many think for a shock to work well should be stiff, it's really not the case.

Something wrong then. All settings should be somewhere in the middle, if it was set up for your weight, in your normal riding kit.

Was that from Nitron direct and new?

The chap is in Ireland mate, or at least that's what his location is stating.

Out of the crate Suzuki's are generally pretty good for you're weight range, but it may not suit how you ride. There're countless U Tube vids on setting up suspension, like most of the stuff on there it's been plagiarised to earn money, so you need to be very selective. As a general rule, sort the sag, then the compression and rebound, you want the back/front ends compressing/rebounding (damping) at the same rates to give you balance. Golden rule one thing at a time and small adjustments, make sure you record all adjustments before you ride. Ride over the same course in the same way, you need about 5 miles, straights, bends (left/right) smooth (if you can find any) and the more normal uneven, if possible some dual carriageway/motorway. Don't forget to test heavy braking. If you're not confident and as has been suggested, find a pro. Good luck.