Grip size affecting lie angle?

Recently got a set of used Titleist 704.cb that I'm going to start working with heading into next year. I've taken them out to the range and played a couple of rounds, and I'm starting to think I need to get the lie angles flattened a bit.

I set up a lie board and tried my old irons (in sig) as well as the new ones. The markings on the old set were centered. The markings on the new set tend toward the heel, about 1/4 inch off in the PW to 8, and about 1/3 to 1/2 inch off in the 7-3. I've also noticed that the toes appear to be sitting up a bit at address.

[Ball striking so far has been inconsistent, although I'm not sure how much to read into that as I grow accustomed to the new, less forgiving irons. I've had ~6-8 straight up shanks per round (and rarely any with my old irons), and when I hit the ball "well," it seems to be a bit of a pull-draw. The draw I expect, as I would get one with my old irons using the S&T;, but evidently the clubface is closing down more than with my old irons.]

Anyway, before I go in to get the lie angles adjusted, I wanted to make sure that this doesn't have anything to do with the grips. The clubs came with Lamkin midsize, as opposed to the standard grips on my old irons. The only thing I was thinking was that possibly the thicker grips, sitting below the pad of my hand, cause a shallower shaft angle and consequently cause the club face to sit at a greater angle to the ground from heel to toe?

Would the difference between standard and midsize grips cause that much of a difference, or is the only real concern here with the lie angle?

I think you know this, but just to make sure... Lie angle is the angle made between the shaft and the floor when the club is sitting flush on a flat surface, it has nothing to do with grip.

A midsize grip, while it might not be ideal for you, really shouldn't change your swing in a way that would cause you to be toe-up at impact. More likely, the previous owner had these clubs bent from standard lie angle. I would go in to your local club fitter and get the lofts checked and have the lies adjusted to your swing.

Right. My title for the thread doesn't express it quite correctly, because you're right, I'm not really talking about the actual lie angle. What I was getting at was that a thicker grip, with more material between where it leverages against the heel of your palm, would theoretically flatten the angle of the shaft as it comes from your hand (end of the shaft would be lower in your hand), resulting in effectively the same result as if the lie angle was too upright.

I didn't figure the difference in thickness would be enough to significantly affect it, but just thought I'd check. I did some checking on the specs between my old set and the new set. The comparable clubs (same loft/lie angles) in the Titleist set have a shaft that is a half-inch longer. With the same lie angle, the extra length could be causing it to go toe-up, I suppose. Thanks!