Logging out on a 50 for rest exper doesn't work the way you think it does.

It's a percentage of levels and as soon as you switch to a lower level the bar adjusts.

I think it's around a week to cap it. The only place it makes a critical difference is in DoL as you are forced to apply action to level those. For any DoH having rest exper means instead of it taking you an hour to get a level it will take you 50 minutes. It's not an efficient use.

Why you didn't get rest?
It didn't see you as in a sanctuary. I don't know why.