[tomw]

Pretty sure you have an IAC that controls the idle speed. If it is not working exactly to spec, you could experience more vibration at idle, especially when you add extra loads such as the A/C compressor.
The IAC -idle air control - regulates idle rpm. It is sort of a miniature throttle, run by the computer. They can get gummy and sticky and be unable to adjust the idle properly. If working, as soon as you start a cold engine, the IAC will raise the idle speed to over 1,000 rpms. As the engine & coolant warm, the IAC will lower the idle rpm to ~750, depending on engine, and hold the idle rpm when you put the transmission into gear. Sometimes cleaning the IAC and the throttle plate and the area nearby will improve idle and response.
OTOH, if it has done this since new, then I got nothin'.
tom

 

[tomw]

I keep forgetting about drive by wire. Pretty sure they do not have an IAC but use the throttle under electronic control to maintain the idle.
I would clean the throttle body and make sure the throttle plate can move freely.
The IAC on the owned 07 uses a passage just to the 'right' or rear wall of the throttle body as its air inlet. It is just 'in front of' the throttle plate and visible if you remove the air inlet tube.
Drive by wire, or electronic throttle is a fish of a different color, and of note some of the other models that use it have had problems. I think it needs to be 'calibrated' when it is installed, so it 'knows' WOT and full closed positions. I do not own one, but have seen/read about them. Being old and sort of stuck in the past, I prefer mechanical control. But that is not going to happen with newer vehicles.
tom

 

[tomw]

Which mounts did you replace? (I replaced both mounts, - from previous post)

It could make a difference.

Did the new TB help with the vibration when the A/C was engaged? You noted it was more noticeable when in Drive, stopped, with the A/C on. Did that improve at all?
tom

 

[tomw]

One other thing you can do while supporting the engine is to loosen all the mounts. That will/should release any tension that would overload one of the mounts while letting one be underutilized. It can happen that the mounts get under tension when installed at the factory(there was a TSB about this) or when a mount is replaced. If you(or someone else) installed a new mount previously, while letting the engine hang on the other mounts, it is possible that the mount(s) are sharing the load unequally, especially if one of the mounts is tightened down when the engine is sagging or high(depends) and is tightened down at the limit(in either direction) of its capability to absorb vibration. I may be over explaining, but if you had one mount that was squished by load, due to another in failure, it could stay squished when the new mount is installed unless the whole assembly was 'leveled' with all the mount fasteners loosened, and the mounts allowed to 'equalize', and then the fasteners tightened. That was the short version of the TSB, more or less.
tom