So you somehow think switching to rigid forks and flat free caster tires is going to help? Personally I wouldn't waste the energy. But then, maybe they are what's giving you the whiplash?
If you do go rigid, you'd need to get air filled front tires. Set them at 8psi and your golden!
A front weight kit is going to make pointing down a hill a dangerous situation. If anything, you should add a little weight to the back as you removed the ROPS I believe. However heavy that is, may be affecting things? On my demos , I had to leave it on and folded. If I bought one it would be removed. I remember the ROPS on my old JD was over 100 lbs!
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