Brian, some of the 'pop' is perhaps being taken away by the background. The reason is that the background, being green, has much more luminance than the flower details. A luminance histogram will tell all with a big hump in the middle and the flower stuff well over to the left.
An adventure would be to change the background color to blue, because:
Luminance = 0.3red+0.6green+0.1blue ...
Et Voila:
RawTherapee ... such fun!
For me the three colors are too equally intense, I would toning down the least natural one or the one that could easily be seen in nature at different tones.