Here is a picture of my OEM 2019 Fox Podium shock. Only identifier on the spring is likely its part # 706001771
My opinion as a suspension tuner AND Spyder owner / rider, you have base Fox Shox on there. Unless you are planning to compete, the dampers themselves, they are likely adequate for your machine. It does appear you have a bit of preload added. Did you wind the preload collars down to increase preload and if so do you know about how much you added?
As I mentioned previously, Fox dampers from BRP or as oem Spyder shocks come with springs identified by a BRP part number. There is no identification / conversion chart to show dimensions and spring rates. Saying all that, and since you have suspension shop you work with, measure and note the preloaded spring length with the shock fully extended. Next, while supported in the vehicle, loosen the spring preload collars fully, this will require supporting the vehicle on the chassis not on the suspension arms. Remove the shocks, then remove the springs. Measure and note the springs free length, the springs inside diameter and outside diameter.
Hopefully your suspension tuner has a an Intercomp or equivalent spring tester and can give you the springs rate after negating any end conditioning effects. With that info in hand, message me back and I can see what options for springs may be out there for you.
I know, you are going to get concerned that with a firmer spring the damping will be inadequate. Possibly, but unlikely. Compression damping, being primarily impact related requires an extreme variation in rider weight or worse, rider ability and terrain. Rebound damping is purely spring control force. It takes a lot of increased spring rate to require a damping change in rebound, provided as is was close.
That said, Fox typically does a very good job at setting up out of the box internal valving. Again, I am not a Fox Fanboy at all, just have plenty of experience with their products.
If I were in you situation, I would first spend the couple hundred and respring the vehicle correctly, set ride height to optimum, not focus on sag since the travel is so little measuring those percentages are difficult and unknown for Spyders.
Entirely your choice, realize the springs support, the damping controls. Plus the best dampers with incorrect springs suffer badly.
All the best with it.