I agree with waikikichan and it links into my earlier comment - you are leaning too far forward after the pop up, which is why you need to hold onto the rail; I suspect that is at least in part because of your leg/hand placement being the 'wrong' way around - and, thinking about it, you may only be able to get into that position because you are holding onto the rail.
In other words, you have a pop up that 'works' because you are adjusting something else to compensate for the errors that are created. But in doing so you have created another flaw...