I had a problem with Challenge Strada Bianca on my Enve rims. The tyres are just too small to start with, but when seated the bead didn’t sit under the hook. Instead the hook dug into the soft and vulnerable sidewall. Within 10kms they always split through the sidewall. First one I put down to being an unfortunate sidewall cut. Second one puzzled me. After several (expensive) tyres, I got the message! I changed tyres to something else (in fact I tried several). The same thing happened.
The wheel has just been replaced by Enve. They acknowledged it was either too tight or the hook was too sharp. No problems since.
So, whilst there are techniques for dealing with right tyres, also be aware that (even with rims that supposedly come out of a mould so should be consistent) sometimes the rim itself might be at fault.
As for those techniques. Use very thin rim tape (Stan’s). Put half the tyre on and sit it in the rim well rather than under the hook before fitting the other half. Have spare thumbs standing by!