Yup went to 5/32 forestay and yes 600# is just short of 20%. I have also reset the mast compression post so it no longer pumps. Keeping the original shroud to mast attachment points allows me to better bend the mast using the back stay when the wind picks up.
I would be interested in a little more detail on what you did with this.
A Johnson Lever is on my bucket list but it hasn't made the short list yet. Other P-I-A's rank higher for the moment.