Yeah, that thing you said about making perfect jumps is what I've done from the start. Just riding it over and over again is exactly what I do, adjusting little things until I the jump feels right. This applies to any obstacle though, not just jumps. To make fun trials that aren't spammy, you need to know how to do this.
Max007x can u get this thread some attention? http://community.freeriderhd.com/threads/community-skate-park-mega-collab.8337/