Hello Jono,
I have not recieved my x-t1 yet but i do use the x-e2
Personally the only raw processors I have been happy with for green foliage are;
Capture one 7; my primary and good for 90% of images.
Photo Ninja; my goto if Capture one can not quite get there.
I have not had an image that could not hold detail n greens.
I reguarily print on exebision fibre at 24 inches short side with no issues.
I primarily use; 18-55 55-200 and my adapted Olympus om 35 shift MC.
I downloaded your raw files and did a quick try through Photo Ninja.
The first file seemed to react really well. just a small adjustment in the detail slider and the grass popped very well.
The second appears to be soft.
Photo Ninja beta is a free download for cross platforms.
I only shoot Jpg for event portraits, so it dificult for me to comment on yours other than; the fine setting jpg with the "s" film setting works wonderfully.
Things to try;
change jpg in camera color to a different emulation.
found the emulators to change items significantly.
I run my jpgs with everthing off (orj as close as it gets) no sharpen, nr, ect.
I am on the road, but can look more in depth later.
Wish I could try it in Capture one, but no support yet.
Hope my own x-t1 shows soon.
If you wish, I can send you back your raws with my prossesing to view on your computer later. Perhaps I can find the time for a quick proof print to see if part of the problem is how the monitors are handling the translation of the images.
All the best to you.
typed on an ipad portable keyboard, please forgive the interesting spellings for some of my words.