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Cars tend to have a weight bias one way or the other, put the heavy end on the short side of the lift, the light end on the far side of the lift.
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Yes, 911's do TEND to have a little weight bias. You aren't likely to have a weight capacity issue on almost any lift but I agree this is a good idea for balance. Also there are some other considerations with orientation with an asymmetric 2 post lift like door opening and arm bend underneath.
If done as suggested (shorter arms support 911 rear) the shorter arms are less adaptive both in swing arc and length so over time it's slightly easier to position when the rear of the car is supported by the short arms because the longer arms can adapt to front lift points. I need my short lift arms fully swing with no extension at all. This also allows you to squeeze the posts together a little tighter in a more confined space like a residential garage as I've done.
Unfortunately this makes the asymmetry work against you and the posts will be in the worst spot for the doors, the doors *may* not open fully if the car is positioned slightly back or the arms are closer together.
If you turn it around and have the long arms supporting the rear then door swing will not be a problem at all. I do find that there is more flex underneath in the longer arms when supporting the engine. And the car continues on several feet after the lift arms to any downward angle can have a more pronounced effect. I have not measured it but I do park below it and I have less clearance that way. Also the car does not look completely flat and with all the weight asymmetrically far away from that post you will notice the angle.
In the picture below you see the black 71T is forward a little more exactly because it would have a door open issue with the posts if it was directly below the white 930. The white car must be forward more to hit the lift points.
In the end these are problems many would like to have but take close measurements of your lift, spacing, lift points, doors etc. because there may be some differences between lift models.
good luck with this
