Never ever, ever - try someone else's springer. They always feel nicer than your own.
Never judge a springer by what it feels like or sounds like - can you hit stuff, that's the bit you're interested in.
I don't think I'd hit less targets if I just swapped back to standard Mk1 internals.
If the time spent tuning your gun causes you to spend less time actually shooting it, you're wasting your time.
Pretty good advice in my opinion.
Oh and if your crosshairs don't come back to where you left them on trigger release, then you're natural point of aim isn't where you thought it was, and you're muscling it to where you want it to be. All things being equal it should be at rest without input on the target, and once it's done it's thing, should come back there.