All things square...downward angle with irons, upward angle with driver.
Driver = aim right?
Irons = longer irons, aim more left, shorter irons, aim left, but less left?
confused.
For me, it's much easier if i know my tendencies.
For my driver, i stand to aim right (very closed stance) but close my clubface to aim down the fairway, swing right, hit up on the ball and just blast it. This gives me more room for error on my true impact path versus my clubface at impact. Meaning, mostly the mishits are a fades or draws but on the fairway. It won't usually result in push/slice/hook. If it's a pull, which does happen occasionally, i know why it happens and can immediately fix it for the round (not swinging to right field). At first it really felt awkward but now i can't argue with the results i'm getting.
For my irons, I just aim straight. If it was hit well, it'll be close to where i was aiming. That's good enough for me. However if i'm having flight issues with irons, then i use the Dplane to fix it on the course, which usually is just my clubface open/close i have to adjust. There is one thing i found out, is that when i want to have a safe shot, a little open stance and an open clubface (close to target) will usually give me a nice soft fade or a big left to right slice or a straight shot, which in either case, i can live with because i've allowed for it.
Just what i actually try to do. I could be wrong totally, but its what i understood from Dplane. Of course with no Trackman, i had to generalise it for myself.