If the Canon Pro-1000 is putting the Chroma Optimizer over the entire print including margins when you have the "auto" setting invoked, then this is exactly the opposite behavior of the smaller Canon Pro-1 printer.
In the Pro-1 Driver settings under the "Clearcoat" menu the choice of "auto" restricts the CO to just the image area of the print and doesn't extend into the white margins of the paper. But Canon should have called this auto mode "economy" mode because on the Pro-1 the auto mode actually prints variable amounts of CO in the image depending on how much other ink is laid down such that literally zero CO is printed into any pure white areas. Thus, the auto mode reduces bronzing but does little to eliminate differential gloss which is easily seen in image areas like clouds that are tonally going from light grays to pure whites (probably one reason why Canon calls it a chroma optimizer and not a gloss optimizer even though it does that too).
To get the CO to print into the white image areas and into the print margins as well you have to choose "overall" mode on the Pro-1, and if you don't want a small (and visually annoying) break in CO at the paper edges, then you also need to choose borderless printing along with the "overall" clearcoat setting. Or, if you want CO overall in the image but not extending into the margins (to keep CO consumption down) you then have to use the "custom" mode which is a two step process where you must build an image mask first in order to keep the CO confined to the image area only but still printing over this image area into the pure whites like it does when using the current "overall" mode.
What Canon should have done was given us a couple more options to make life easier for everyone. The clearcoat menu should also have a "none" mode if you don't want to use the CO at all on a glossy/luster print (e.g. if you want to post coat the print with another type of spray like Premier Print Shield). I could have sworn that option was there in the Pro-1 driver originally, but on the latest Mac driver, the only way to get "none" on the Pro-1 now is to make a custom mask using the "custom" mode which masks the entire print area. That's a PITA, but it works. Next, there should be an "economy" mode setting that acts like the current auto mode, and then a superior auto mode which should function exactly like "overall" mode does now except be confined just to the image area. Again, you can create this superior CO effect by choosing the custom mode feature, but again, it's a PITA to have to resort to the two step custom masking feature because it requires an image editing layer to also be made by the enduser. Lastly, the "overall" mode should remain the final choice and function like it does now,i.e., extending CO fully over the whole print surface when you also choose borderless printing.
I'd be really surprised if the Pro-1000 driver invokes the CO clearcoat menu choices differently than the Pro-1, but I don't have a Pro-1000, so I can't confirm. If auto mode now coats the image area fully, then perhaps Canon listened to some complaints about the Pro-1 auto mode not cleacoating the white areas in the image and improved the auto mode on the Pro-1000 as I suggested above for the Pro-1.
best,
Mark
http://www.aardenburg-imaging.com