Hi, yes you are right in suggesting 60' is 1° .

With Rear Toes at +0°11' (at LR) and +0°40' (at RR) i.e Rear Total Toes is +0°51' .

As suggested by @amduser above:

I would be surprised if you do not have outside edge tyre wear as suggested.

The question is:
do you experience more outside wear on Right Rear tyre only,
or Left Rear tyre only,
or both rear tyres wear at the same rate?

I concur you should experience understeer phenomenon when pushing the car to the 'limit' during fast cornering/turning if you know what I mean.

You don't feel it that way. But that maybe you were not pushing hard enough? IDK.

The little bit of body vibration when getting up to highway speeds that you experienced is most probably caused by what @amduser says:
Ok, you have decided on doing a shimming job.

Care to enlighten us how long a time is the job?

Types of shims or washers used, material metal or plastic elastomers?

Thickness of shims used?

Only on one side or both sides of Rear?

How much is your wallet damage?

How many times does the shop dismount and remount the tyres onto the tyre rim hubs, as I read it could take a long time like 2 rounds or more in between setting up on alignment machine?

Would appreciate if you could upload the Before and After Alignment print out to share about the quality and finishing to the shimming job as well as the alignment job.

Do you mind sharing as I am very keen to know the name and location of the shop that do your shimming job for I have been researching/enquiring about it for my Avanza rear axle without success thus far, and also location of alignment shop if they are another different shop.........
assuming you are quite happy with their rear axle shimming and alignment workmanship and pricings.