^ This. Curved and straight geometry are mostly just for simple elements like lift hills.
Speaking of lift hills, yours is much too steep for the height, (The exit I mean) and consequently has a wierd shape. I imagine something like this is what you were going for:
http://www.rcdb.com/m/3799.htm?p=22548
Your first hill is also too circular, it should be parabolic. I can't quite tell from the angle you posted, but the turn under the lift hill looks like it doesn't have enough banking during the exit. But most of these problems will fix themselves if you work out force based geometry.
Your lift hill supports look very uneven, some much closer together than others. This also led to some of them being too close to the track below. You don't even need that many on a track of this height, see how sparingly they're used in the link I posted.
Also, I wouldn't use 4 tube on the whole track, Intamin tend to vary it a bit and mostly use 3 or 2 tube on a ride this size.