I have a set of DCI 981 irons (which have the same specs as AP1). I had them fitted with a lie board and the angles were bent to match the specs listed here.
The 5-GW all hit perfectly straight, although I do choke a small amount for them to hit cleanly (the 5 iron is 62* with a shaft length of 38 1/8" and the PW is approx 35.75 with lie angle of 64.5). I had been having some difficulty hitting the 4 iron cleanly.
I also have a set of Eye 2 yellow dot irons that hit dead straight and they are about 1/2" shorter than the Titleists; an eyeball shows them about 1/2 degree more upright. They're in the process of reshaft.
I took the 4 iron to the fitter and had him shorten it to standard length (38 1/4") and change the lie angle to 61.5 (I put a Winn Excel RF midsize grip to compensate for the two point swingweight loss). This is also consistent for what a Eye 2 Yellow Dot iron should be. I hit the ball cleanly with the 4 iron but with a small fade or about 5 yards right - consistent with the club being 1/2 degree flat.
Would an AP1 4 iron with a standard length of 38.25 and lie angle of 62 deg be consistent for someone who is 6'1" and WTF of 35.5"? Most charts say I should be a degree upright.