with it setup like that you have all the pressure going to that catch can but its got nowhere to go so its just going back and pushing past the oil cap with that type of catch can you need to have both pipes from rocker cover to go to the same inlet on the can by using a t piece and on the outlet have a bit of pipe pointing to the floor with maybe a little filter on it so that way its letting the pressure get out To test it you should disconnect one of the braided lines to the catch can and run the car, if it runs better then you know thats the problem