I also agree with the previous posts. This is an extremely sophisticated build, and while you are a good player at an 8, some of these are such nuance builds that I think only a tour player could relate to. That being said, the lie angle does have me a bit confused, BUT you really need to know your starting point in your old irons compared to the new. Some OEM's have different specs than others, so going up or down is really a matter of perspective and what is the starting point? If the fitter was such a stickler on the lie angle, did he bend his fitting heads to match what he was giving you? What was the result? Did you hit these better or have a better dispersion than your current set? What shafts are you playing now that you were fit into 2 years ago? Would the shaft change make you deliver the club in a different way to account for the lie change?
If these are your dream clubs, and you have this much angst with the fitting, I would recommend going to talk with them again and let them know your concerns. If they can explain the specs in a way that make you feel more comfortable then proceed. If they tell you they are "just a better fit" and not explain it, then I would move on to another fitter if possible.