You should plan your coasters out before you make them and even though I dont do it your should also plan out where your supports are going to go. This way your coaster will be really good when you finish it. Do it on paper and its also quite fun to do.
new layout: vertical lift suddenly accelerating at the top leading into the vertical drop. Then, a winding overbanked turn leads into 2 back to back inversions (dive, zro-g-rll)...kinda get the idea?