I'm on Phoenix and I recently lvled DRK and SAM to 37 (from about lvl 25) without much problem, and have been lvling NIN (63) over the past few weeks. Most of my parties were after my LSs events though, so usually from 11pm onwards
Guess that doesn't help much. I did exp a few times during the day, slightly slower invites but still ok.
Just curious, which part of Scotland are you in? I very rarely see other Scottish players even though I'm in a EU endgame LS. We get loads of English applicants, but no Scottish. We even got someone from Wales..