How can i make my tekken 5 ps2 do kara grabs and etc?

I noticed that my tekken 5 hori ps2 stick (Not modded) does not KARA , it will only come out 10% of the time where as in the arcade on regular happ buttons i can pull out a simple ryu kara grab 80% of the time? i can’t even do kens easy kara grab, i dont know if its because of the buttons or the adapter, can anybody help so i can execute more karas on my ps2 stick?