I honestly think you're over thinking this. MTP looked good in your first picture because it was sunny and the tones matched the lit up foliage. DPM will look better when it's less bright. Against a sun dappled background, yes a solid block of OD will stand out but if you're standing in the open instead of hiding behind a tree or at least attempting to use the available concealment then the colour of your plate carrier is pretty irrelevant.
There's a similar thing in action every time I go to the Mall. Different, granted but similar - loads of people go for the all black SWAT/SAS look presumably thinking that if that's what the big boys use it must be right but actually apart from the dark areas all black sticks out like a sore thumb. ATACS AU works a lot better because it blends with the surrounding colours but more importantly it breaks up your outline. Let's face it, when it's dark you can't see what colour you're wearing anyway. Same with outdoors, as long as you break up your outline and don't silhouette yourself then you'll be better concealed at 40m than someone wearing all multicam standing in the open.