Actually, you are correct. Sorry for the misinformation.
The Red Spring is stock. There are Blue (firm) and Black(extra firm) springs avaliable. I replaced the Red in mine with a Blue which made it much better for me (190 lbs). While my teammate changed out to a black (he's 200 lbs).
i have a psylo xc that came stock with the soft spring, so I switched it out for an extra firm set and it's great. It still is pretty bouncy with that spring but not nearly as bad. as ChrisKring said, it's 30 bucks so you wont be out that much