You need to set the heartline up for the coaster to make sure the rolls look right. Find the setting in the coaster properties that allows you to set the heartline to "center of current style" and use that.
The ride generally felt really long and got a little boring in all honesty. What smiler does well is that it bombards you with elements and it is super compact which all adds up to being more than just a bunch of inversions - which is what your ride felt like. Think about your layout and how you can maximise the speed and area that you have to work with!