I suspect 320mA is too high and not an acceptable parasitic draw with most modern cars being in the range of
50 - 100mA. though found nothing in a quick check of the VF workshop manual.
But i agree with stooge, something is causing battery drain and the dealers either has no clue or can't be faffed spending the hours needed to solve the issue.
What's of interest is the service manual states a vehicle wont go to sleep if the transmitter is within range. So if you park your car in the garage and then drop your keys in the hall side table which shares a wall with the garage, then maybe, just maybe that key is being detected and that is stopping the car from going to sleep.
Also of interest, you could try and put the car into "transport mode" which reduces parasitic current draw even more and allows up to 70 days before tha battery goes dead. you can find this on page 7749 of the VF service manual
on post #9 here .
There is also another way to more easily test parasitic current draw on each fuse without removing the fuses so avoids the issue of the system potentially jumping out of sleep mode
PS: the above method is supposedly unreliable for fuses >25A but the issue with our complex cars is that a parasitic current can be large but intermitant and thus could be easily missed whatever methid is used (unless your methodical and really take your time). Here's another video that goes into some more of that detail (though it's ford centric)...