For target archery I use point of aim. I pick a point below the target and aim at it. If the arrows go low, I aim higher, if they go high I aim lower. If they hit the target I try to remember what spot I was aiming at and hope no one stands on that flower, or kicks the stone!
For field I look at the target, come to full draw whilst still looking at the target, and bring the point into my field of vision, when it looks right I let go.
As for the arrows, (assuming that you're right handed) well if they go left they're too stiff, put a heavier point on. Make a weaker set, or maybe make a string with a couple less strands in. (Be careful not to go to a string that's too weak)
If they fly right, then a lighter point, weaker arrows or a heavier string should do the trick
Daniel