Yeah. Thats the general idea. Most of the time exp is turned off every 5 levels, 9, 14, 19, 24 etc. but in the lower ranges there are contacts that outlevel weird. 7, 8 etc. When the contact has more than one level range you need to track that as well. My spreadsheet has every contact blue and red and the level ranges. Separate sheets blue red. With Blue you do need to find which randomly rolled contact you got and compare that to the other 4? Contacts. Delete those or mark them completed. That is not for all blue content, just some of the storylines. But it goes on quite a few level ranges.
Once you get later in the game Blueside you will start getting kill 20x in Peregrine. This will suck hard. There are a lot of them. Generally the mobs are only on certain areas and there are damn few. So you kill everyone in the area and get away so that they respawn. Hopefully as the group you need. Tedious