Paul, what shafts are in your irons? I'd guess they're way too whippy for you and that's contributing to your waywardness.
What's your driver and 5 iron distance? Real, not guessed. Have you google earthed them? Had your clubhead speed checked?
As for 3/4 shots, well, it's not about taking any off it, it's about learning to restrict your backswing and then still hitting the ball hard. Look at every pro(Daly excepted) and see how they make a 3/4 turn with their irons yet still crush the ball. It'a all about compression, mate.
It truly is the way to hit it far and straight, but if you think about taking some off you'll lose commitment to the shot.
you're right about the short game being key though.