I have to agree with the 2 themes looking a bit "thrown together" but I know you probably spent alot of time trying to get it to look just right.
I've had a few layouts that no matter what I did, I couldn't get it to look natural or interesting . Sometimes it can be just one rock or a piece of wood which is skewing the theme of the tank.
Don't lose hope, and keep at it until you're satisfied with the overall look .
Much easier to make changes now than when everything starts growing in.
From all the reading I've done in this thread, it comes across as you are more than willing to spend what it takes to get a great tank . - Layout is one of those things that will make or break it. Take your time and change things around until you find something that works for you.
If the rocks & wood aren't doing it for you , change it up - Don't limit yourself to the stuff you already have on hand if it isn't working . There's a lot of ways to find good driftwood if you can be bothered hunting it yourself. (beaches / teatree roots ) I don't recommend paying petshop prices (like $40-50 for a small to medium chunk of wood, with saw blade markings and all.)
All in all, your tank and setup is amazing. The layout isn't holding up it's end of the deal.
I enjoy checking back every few days for updates, so keep us posted !