Hey Fernando, watching your videos looks like that shock rebound is too loose. Rear shocks can't keep tires planted at ground and that's causing tire bouncing. Maybe ceramic clutch can be another factor for cause this. As you said that you are using old tires, I would start changing tires for brand new tires like 28x10 or 28x10.5.
Good luck and keep us informed!
Hello Diego, yes, looks like there are some consensus here. I need new tires 28x10.5 and some work with the rear shocks to solve that bounce. Additionally will work to change that 3speed to an automatic transmission. Loosing to much time between gear changes with this transmission....
Thanks for all imput guys! Will keep you informed on next passes...
