It is indeed rough to get teams between the 100-160 range, it will be a bit easier once you get to inferno. Luckily enough there are plenty of questlines you can do that will help you power through a bit. Most veterans save them for later on but if you are stuck in the levling they are great.
First I’d recommend trying to solo Mortiigs as far as possible, usually you can stay there until 105-110 if you solo, Valirashes at the entrance in Scheol also gives quite good XP and mobs in the area can drop DOJA chips.
Elysium has a lot of Yutto quests that you can do that should cover quite a few levels if you’re stuck soloing, you can find them all on AO-U (personal recommendation, save the Catacombs one until 144, iirc those gets you to 150 for dark ruins that will in turn get you to 157, then a few steps of the adonis or penumbra questlines will get you to 160).
In Scheol you can also do quite a few steps of the two big questlines there for quite a few free levels. You can’t solo all of it at your level.
Then you have The Reck dailies that can be handled, there’s also the hecklers in The Reck, they give quite decent early on.
And dont forget the elysium/scheol key quests 
So to sum it up:
- Grind to 110
- Elysium Quests
- The Reck Dailies
- Garden Keys
- DOJA Chips
- Scheol Questlines
- Dark Ruins Quest
- Adonis Questline
- Penumbra Questline
The game is a lot about knowing what you can do solo, some veterans doesnt even touch kite teams. You can’t do all of Scheol/Adonis/Penumbra questlines solo but you can do enough to get you the needed levels.
Good luck!