Decrease your chain lift speed. Don't you brakes on a curve, use a transport segment. Your ride is smooth beside the drop, and the banking transitions in the end.
The immelmann was really good, your airhill could use a reshape, and maybe you should think about adding something in the midst of all those turns in the end. And supports on the barrel could also use some work.
On the level of improvement though, I have to say with all the garbage you have taken from people, and the lack of real advice, I'm impressed with your work on Net Force compared with your older creations. I'm glad to see you really taking the time to work out this ride, keep going.