Agreed, on making the track newbie-friendly and forgiving.
But being forgiving doesn't always have to be boring, and it is not impossible to build it for both 1/10 and 1/8.
Say, for a section of jumps, 3 or more jumps can be made. The 1/8 can do triple, and the 1/10 can do double-single, or single-double, or single-tabletop, etc. As for the other slower cars, they need to be able to roll all the jumps in the track. It just boils down to planning and testing the jumps out with different cars.
When we build our 1/10 backyard track, a receiver ramp (landing) can be built and torn down 2 or 3 times, just to get it on the correct spot.
Regarding jump angles, just try to have a bigger landing ramp, perhaps 2 to 3x the length of the launch ramp. While also making sure the launch ramp transition is a smooth upward curve, not so sharp that a car scrape the chassis (fully compressed shocks) before launch off.
My 2 cents
