suspension upgrade

So I plan on upgrading the forks for track only use in the most cost effective way as I’m only an intermediate rider doing it for fun (no racing just yet) would I be correct in saying that 8.0n k-tech springs and 5w fork oil would be sufficient for a 75 kg rider? Any feedback/ opinions on other...

Hello, just what the title says. I have a 2017 and I want to upgrade my suspension. Apparently, the Yamaha R-series rear shock absorbers that are compatible don't fit 2017+ RC390s without deleting the cat. I'm pretty darned ok with the bike's performance on the street and highway, so I really...