This doesn't even make any sense!

I can do Chun Li's just fine,but not his!?

What am I doing wrong!?

I push down and forward twice in succession, whilst hitting l1-triangle andsquare at the same time on the second push -seems to do the trick but a lot of the time i end up doing dragon punches, any raises on this technique as to a less dragon punch prone ultra?

To make sure you don't do a dragon punch don't perform the pad rolls too fast. It'll still register the ultra if u leave a gap between the two, so get that timing down and you should have no problem.

Thanks guys,the tips seem to be working.

I was inputting it way too fast.