tips ?help with the baby arm and twist tri and twist bar

I had someone in the baby arm position after using the da sweet from jiuclaw I had gotten to from rubber guard and they kept moving their and so I couldn't get the right angle for the baby arm maybe I didn't have the elbow underneath my bottom leg enough that's what im thinking and do you guys know any drills that incorporate the baby arm? and the submission series twist bar and twist triangle and any other moves that have been setup from their I got that from eddies twister book that I have