I think the inner gray stroke (above the tree) is just a hair too wide - it doesn't look like a natural highlight / shadow. Can you make the stroke a pixel thinner.
Also, it looks like the top of the "D" at the end is lower than the top of the "N" at the beginning. Can you double-check that? They should be the same height.
And can you show us a couple versions with this thinner stroke with a different background - one the gold like in #35 and another green like in this sample logo. You can use the two green shades to create the radial gradient in the background:
http://2.bp.blogspot.com/_Avtt0o7q5_4/SuxuhEljPXI/AAAAAAAADhw/FkSfRquvnrM/s200/Ligonier+Logo.jpgThanks! This looks awesome.