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I'm really surprised you need a spring rate that high, if you're only 4kg heavier than me. I know it's different shocks, frames, curves, travel, etc. and hard to make direct comparison, but that's a big difference.
I often find this with my friends bikes, similar travel and body weight yet very different spring rates. It's nothing to worry about.
I have a Propain Rage dh bike, when I bought it I used the TF tuned calculator and it said I needed a 400lb spring. In use it was ridiculous, sat at about 60% sag. Turned out that particular frame has some unusual characteristics and Propain have their own spring calculator that put me on a 550lb spring.
I'm really surprised you need a spring rate that high, if you're only 4kg heavier than me. I know it's different shocks, frames, curves, travel, etc. and hard to make direct comparison, but that's a big difference.
Maybe you're way gnarlier than me though, who knows 🤷🏼♂️