I put those springs on my rocker and love them...But I use SE heavy duty fork oil and I think that helps. Like you, I'm not a light weight...LOL. Ride safe.
yeah you were correct, I went ahead and removed the springs collapsed the forks then over filled the tubes and used a fork oil syringe type tool to get the level at 5.5 inches, per progressives diagram and instructions.If you followed Progressives advice then the preload should be OK but why not check it before doing any mods. Measure total fork travel (height with front wheel off the ground - height fully compressed). Then measure height with bike on the ground with no load. Pre-load should be about 20% of total travel. This makes sure the wheel can go down holes as well as up bumps!
If that's OK then I would try Screaming Eagle oil but measure the height of the oil in the fork rather than the volume you pour in (as per Progressives installation instructions). Worked like a dream for me.