Andrew,
If you're not having symptoms of low T (which can include poor or no morning wood), but you're only in the low normal range, this shouldn't matter. If you're healthy (i.e., you have energy, you sleep well, you're mentally alert, you have a healthly libido and can get/maintain erections, you can develop normal musculature, your bone density is okay, etc.), it really shouldn't matter that your T levels are low normal - Maybe you're one of those cases where your optimal level is "low normal." If, on the other hand, you're having symptoms, you might want to ask your doc if there are other options (like TRT or HCG) you can try, to get your levels up a bit. Good luck, buddy!
Mac
P.S. - When I was in my late teens/early twenties, I was in a similar situation. My T was about 550 (low normal for a guy of that age), but I wasn't showing ALL the signs of low T (I had a great libido, morning wood, erections, blah, blah, blah...BUT I was VERY skinny, tired, couldn't develop musculature all that well, etc.) My doc. decided to do nothing. I guess I'll never know if that was a good or bad decision.