I expect you make divots deeper in the toe? Probably make contact just a bit thin at times, and have a hard time hitting off the ground?
I used to make toe down divots. I blamed everything from shaft droop to the lie angle to uneven tee boxes. Turned out to be a combo of slightly off setup position and way off impact position. Once I figured out I could hit anything from 2 up to 2 flat perfectly fine as long as I got my impact right, I started to suspect the importance placed on static lie angle. I do fit into 2 up, being tall without particularly long arms, but you're 5'9 and should stick with about standard unless you have long arms or your swing is very consistent. It's the last parameter you should use to adjust your ball flight, by the way. And that bit about the shafts affecting your flight is subjective. If your mechanics are correct, you'll hit playable shots with anything close to a fitted club.
If you raise or lower the handle, say, an inch at address, and return it there at impact, keeping everything the same, the sole is just as crooked or more as if the lie were 2 degrees off. So it doesn't matter what the lie angle is if you aren't delivering it properly. You can also find that rotating the clubface or moving the handle forward will affect lie angle at impact, especially with the driver. So delofting to get more distance and compression can also change the effective lie you see at address. The further off plane you get, the more it can require compensations to return to level. Just from having your hands an inch out of position, you get as big a difference as you would from bending the clubs. You'll notice this on balls above and below your feet and it's the same concept.
By the way, getting the lie angle perfect at impact is the best way to present the most loft to the ball possible. This will not only result in straighter shots, it's how people hit really high and powerful shots with low lofted clubs. I could hit 200 off a tee with my 5 iron, but it was a really low and sagging flight and needed to roll a bit; a combo of always hitting it a bit thin and not being able to get the delivered loft or angle of attack right. Now I hit my 5 iron 200 with a smooth swing, nice and high with plenty of hangtime and landing softly, and I can hit bombs with it another 20 yards off the deck if I wish. No change in swing speed, just better contact and more efficient impact.
Try squatting a tiny bit more and keeping your head level the same, placing the ball a slight bit farther from your body, and keeping the extension in your left arm and the wrist from cupping. Don't reach for the ball, but keep your weight centered from heel to toe. You want to shift your weight to the target as aggressively as you feel comfortable doing (not quite enough to compromise balance), and stay in sync.
Don't believe me? refer to this thread: http://thesandtrap.com/t/64131/effects-of-lie-angle-on-varying-degrees-of-loft
Good luck out there.