Another thing which I thought I should mention is that unless you are putting out 230-240rwkw, your injectors won't be maxing out so there is no need to increase fuel pressures. Your engine knock is most likely being caused by ignition timing incorrectly set. If you have a tired pump, blocked fuel filter, dirty injectors, dirty or old spark plugs, worn or old coil packs, inefficient cooler....these things can also cause engine knock.
It's not about the race to dump more fuel in to get higher hp figures. The more fuel you put in, the slower your car will go.
You have to tune the car to run an efficient amount of fuel air mix. You may find that by decreasing the fuel (running it not as rich) will give you more hp. You car should be able to handle 14psi with no problems at all.