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If it was me and I was changing from the ATE, then i'd go for the Motul. It doesn't seem to badly priced but the Castrol is a fair bit more in comparison.
But I suppose if you want the best, then you have to pay the money lol.
Could be toeing in a bit or tyre pressure on the day. What pressure did you have in them?
I know road tyres with softer side walls need over 30psi on track to stop them rolling over onto the side walls.
If you're changing it fairly regularly then wet boiling points won't really apply as much because it won't have had much moisture absorbed into it.
But it is worth noting, yes.
The higher the number, the more the wheel will sit in the arch.
So your one ET37 will sit out wider than your ET40's. So in theory you'd need a 3mm spacer on the three ET40 wheels.