Replying to 270 out probs

so its my first year being able to slide any rail completly and i'm pretty happy and i finally got my 270 ons ok, but i'm having a hard time 270 off backside. Like on my 3rd try i got backside 270 offs a month ago off a twin barrel like almost every time. Then i learned it on a flat bar like a week later pretty good. Like 2 weeks ago i started having probs. Itook a break doing them because i spent all my time learning 270 onns and i hurt my leg so i had to take a 2 week break. Now i'm lucky iff i can get a bs 180 off a flat bar. I can butter it around to a 270 but its not steeeeezy. I actuall learned frontside 270 off today trying to do backside:<) But anyway wenever i try to do a backside i catch my edge on the end of the rail or something else stupid happens. I'm pissed cause i hiked this 15 foot flat bar like 30 times today and only got it like 2 times. pleez help