Give Honda hp2 oil a go, I've used it for years and never any smoke or fouled plugs. Most oils are all the same until you pop the head off and look at all the carb build up.
For starters adjust the spring until it don't bottom out on about a 2 to 3 foot drop off then adjust your rebound to where its a little springy if its to fast when you hit a hill it will unload and lose traction. If it still bottoms you might need a stiffer spring or have your shock rebuild.
I agree with the time limit but the camping out with your foot on the ground is cheating. Alot of people I know won't even watch trials anymore. If your stopped and have your foot on the ground its a 5. I think they let to many riders slide on that in the '90s. Bring it back!
