When is "early morning Sunday"?
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Just a reminder that the Canon teleconverters will not work with the macro lenses.
Since you mentioned that you miss OS with the 180mm macro, try out the Sigma 180mm f/2.8 OS.... I have only read that Sigma 150mm is very good, however I have not read that much about this 180 f/2.8 OS macro from sigma. I could not find either of them at my local lens rental place. If you have the chance try it to see if it performs as well as the Canon 180mm but with OS.....
Neuro has given the practical steps to take, another, obviously, is to shoot RAW, there is often some headway in the RAW file above the histogram that is generated from the preview jpeg that is affected by the picture style choices in camera, even if you are only saving to RAW on your card.
When shooting flowers, a regular source of severe red problems, it really helps to use an X-Rite Color Passport and make some camera profiles, it is very easy to do, especially if you have Lightroom or Photoshop, and will dramatically improve your colour renditions.
Set your picture style to neutral, display the RGB histogram and ETTR using the red channel. To take it a step further, you can use UniWB for a more RAW-relevant histogram.
If you think so highly of third party lenses I must ask you to buy my Tokina ATX28-70 f/2.8 which although very sharp with my EOS1n and EOS620 cameras it is a nice PAPERWEIGHT on my EOS5Dx cameras.
So except for a case where I bought a Zeiss lens 3rd party is not an option. PERIOD.
Everyone who tries to tell me otherwise, they have to buy my nice Tokina paperweight first.
I was lucky to get rid of 2 Sigma lenses in part exchange in a shop.
Birds in flight, you say? If this video doesn't convince you how fast Dual Pixel PDAF on the 70D is, I don't know what will. It can track a BIF over a field (2nd video from the top of the page, around the 0:46 mark): http://cweb.canon.jp/eos/lineup/70d/info/af-tech/index.html
After seeing this I'm even more convinced now about this revolutionary tech.
Good point. Obviously, on a tripod one would usually manually focus with 10x Live View anyway. But the macro lenses take a hit on AF performance spec - despite being an f/2.8 lens, the 100L IS Macro is in Group C, meaning no f/2.8 high-precision cross points are activated, just the f/5.6 crosses in the middle and the f/4 crosses at the sides (and all of the f/5.6 lines, too). The 180L Macro is actually in Group G, meaning only 33 of the 61 AF points are active at all, and for cross points just the 15 f/5.6 ones in the middle.
One other thing to note about the 100L vs the 180L is that the 180mm lens takes TCs, meaning instead of 1:1 you can get to 1.4:1 or even 2:1. With the 1.4x TC, it will still AF in Group G. With the f/8 AF update, I'm not sure if the 180L + 2X will AF using the center point or not. While it's physically possible to use a Kenko 1.4x TC on the 100L, there are issues with doing so on the 5DIII - it you have AFMA enabled on the camera, the Kenko 1.4x + 100L reportedly causes the 5DIII to lock up (meaning battery removal to reset).