So I've been struggling with my 13.5 450 FE regarding suspension (and turning). I tried all types of things like running less sag, more sag, I "bracketed" the suspension, went all over the place with the clickers but, no avail. Really confusing to me because the 2012 350 SXF I owned was great for me and I liked it as soon as I got on it. Now I'm 41 yrs old 160lbs in my birthday suit and a faster 40B rider. I couldn't figure out why the bike acted the way it did. I thought the bike had the same chassis as my 350, yet it killed confidence as the front end felt loose sometimes and I got the idea it was going to give me the shaft someday with a no warning front end washout that would put a handlebar end in my sternum at speed - good times!!! Anyways, looking into it, the 450 has a 50N/mm spring while the 350 is spec'd with a 48N/mm. The rear shock spring rates are the same. Well, I put in the 48 spring, dropped my oil height to 360 cc and well, it was a revelation. The bike turns great and I was getting any inside line I wanted today (and making some new ones!). I think I rode the bike faster than I ever have since I've owned it. The front end feels planted and the "loose" feeling is gone. I no longer fear a high speed wash out and I can really hang it out again. Finally, I'm using full travel - something I haven't been doing, and that's with full whoop sections and a 115 ft table top. Also, I never "clanked" the front end once today, just smooth useage of the travel. I hope this helps someone.