Replying to How to stay on the goddam rail

Ok so this may seem like a stupid question but one of the most frustrating things I find is falling off a rail early. So on my backyard setup I had a 10 foot rail and it was to short for me to do anything like k feds, brittanys, ray charles etc... so now i added an extra 8 foot rail and connected them but now i keep falling off the stupid thing to early before I even start the trick. But for some reason if i turn it into an elbow rail i can do it fine every try. So can someone please give me some tips on how to not fall off cause its frustrating as hell :(((((((((((. +k for answers