Thank you for that. It's why I do these videos, hopefully people can learn from my experiences. Sometimes the mods are great and sometimes they are not so great, lol. I try to be honest about them and I'm not afraid to admit when things are not what I hoped for.
It really made a difference in the ride, it softened it up quite a bit and it's not so harsh now. In the link you'll notice the springs come in different weights. The 550 is good for my 210+ pounds. But a lighter rider could go with a lighter spring. What else is important is the shock length. Measure yours just to be safe, eye to eye length. I went with the 165mm length.
It's an anmeilu brand tank bag that I purchased on Amazon. If you watch one of the assembly videos I did with the accessories I may have put a link in for it.
I think it's right in the sweet spot. Any lighter and it would be too soft I think. It really softened up the ride and I can actually feel the suspension working now. Any lighter and for my weight it might bottom out on the big bumps. When I originally set it up I was just under 220, I've lost some weight since then and I'm just under 200 now and it still feels good. Also keep in mind that I commute on this bike with a top box and my lunch, thermos, etc goes in the box so that's another 10 lbs ish. I hope this answers some of your concerns. I think you'll be ok with a 500 to 550 lb spring.
Well after commuting for a few days I can definitely feel an improvement in the ride. It's softer and not so jarring without being to soft and spongy. For my 200+ lbs the 550lb spring is great.