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9 times out of 10 it has always been an injector for me.
Easy to test, just pull the power connector off each injector one at a time. If the engine note doesn't get any worse, that's your one.
Yeah they should be spot on. It's usually a sign of them not working properly if they don't feel right.
Usually a sticking piston.
Check the seals @K_McDermott and make sure all the pistons move out when you press the pedal.