De-leveling is a bad idea, if anything make an alt and level him up until your friends are in range. Another thing is that even if you CAN group with someone, the higher level person is going to eat all the XP if the gap is big enough.
level + 1/2
level 10 can group with 15
level 20 can group with 30
level 30 can group with 45
level 40 can group with 60
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