Wow man, that nrg-500 montage was sweet for an ipad! It seems it's response times for your inputs are very laggy which would make it very hard to stunt. Keep on stunting and having fun, and when you can download SA for your computer. It's pretty easily accessible to get for free, and then you'll be able to use stunting tools (like Dannye's main.scm) to make stunting easier so you can try more difficult ones!