i just want to give 1 tip.

once you are going to become level 60, try to get all your chars to BE level 60 before you logout for a day or so.

I didnt do that, 1 char was still 59 and the other 2 where lvl 60, then i logged out in the inn and started playing the next day...

The lvl 60's where rested way longer then the lvl 59 resulting in the lvl 60's getting furthur and furthur away from the 3th one.

This has todo with that the speed you build up your rested XP as a % off your XP needed for that level.
and lvl 59->60 is about 1/3th off the xp needed from lvl 60->61.

So when you are about to ding lvl 60, try to let them all ding at the same night.

with me they lvl 59 was 3 bubbles behind when the others dinged 60. now they are half a level apart, resulting in me letting the ones who are ahead rest outside an inn to get them closer together.