Derek...you have a really nice little collection going there...best of luck on your quest!
As to the grading, I would have to agree that SGC seems to be a bit harsher in the past year, in fact it seems that a high grade card under this regime would be pretty hard to come by. I don't collect high grade cards, but naturally when I submit my own cards, I want them to come back as high as possible. My recent sub was certainly not over generous, although I don't think it was worthy of giving up on the process either. When you are in the 10-40 range, you cannot expect miracles
Your cards are still very nice, and most folks here will recognize that despite the number on the flip...I say keep going if you are happy with the results. You have a good eye for presentable, collector grade cards!