Geoff - On my intake, I have three ports in the same location that you have (2) arrows to in your picture, two of which are capped off and the third one has a hose that goes to the fuel pressure regulator. That is definitely not the same as the two areas that were in my previous photo. I've taken another photo from the rear of the intake to show the location of the IACV and EGR bosses that are plugged. This photo should show it more clearly.
If you spray carb cleaner in the throttle body, yes it will bog down some. What you want to do is spray it around the intake manifold and gaskets, basically anywhere downstream from the butterfly that would have vacuum. If there's a leak anywhere the engine should smooth out and the rpm should change. You have to make sure that all open ports that are not used are plugged and that any gaskets are sealing properly.
You should also check that the accelerator cable is not hanging up anywhere near the pedal or the throttle body.
If you can't find anything else causing the high idle then you can remove the throttle bracket upper torx bolt and adjust the idle speed. The way I understand it, you usually only have to set the idle once on a FI car and the IACV should fine tune from there. But since on a Zetec Seven installation the IACV is removed, that ability is no longer there. When I was running the stock FI setup, I remember the idle was really low when cold and only got up to the normal 800-900 rpm once it warmed up.