Steps taken thus far is to reduce rear pressure to 12 psi, front pressure to 18 psi (both are now fully contact while rolling - I'll have pics later), 450-470 lbs in the FEL and mow light going up and heavy going down.
Except for the rears being at 12 psi, the last time I BH'd, it worked out pretty well. The extra weight in the front seemed to make it more stable and the front seemed to lift and bounce less as well.
And yes, I have a GST, 12 gears up, 8 gears down, nothing that says "low" although obviously the lower the number the lower the gear.
Someone mentioned "grooving" the rear tires: any pics of that and how do you do it?
Thanks!