Glad to hear you found several problems that may alieviate this. Today I was out riding the Harley, when I had a momentary daydream(were talking split second) I refocused on the turn ahead and realized I was entering it way to fast, I grabbed the brakes and rapidly downshifted, when I let out the clutch, I got my own version of the dealth rattle, back tire skidding, bike going highside of the turn, I kicked a foot out to counterbalance, did a little jig on the road, made the turn, and came out much more focused. Down shifting , I thought I was in 4th, but was in third, was not a good idea. This bike does this to me about once every two years. The former owner warned me to watch it on the turns as the bike liked to go straight! This is very true!
Hopefully the shocks and wheels will cure your problem, and no beers with lunch will cure mine!