You should do that this guy do, he explained it how it works this mod. All credits to him, his name is Darwin on Steam, you can find his message in the discussion called "Ini files not completely there"

This is his problem and how he solved it:

(I recommend you copy the entire "[CustomLevelDistrib]" part into your ini file, that way you just have to change OverrideOfficialDifficulty and MaxLevel settings.)

I was experiencing the same problems, missing lines in the ini as well as dino levels being capped at 145 when I had set my ini to spawn levels up to 180. I am playing on The Island and upon loading a Ragnarok world, I noticed the mod was working properly and spawning levels up to 180. So I messed around with the ini file today, and was able to get the proper level dinos spawning with Ragnarok level distribution on The Island. Here is what I did:

1. Added the missing lines (WantsRagLevels=True & WantsHighLevels=False) to the ini
2. Set all weight related ini lines to 0
3. Under [serverSettings] in the ini, I added the line: OverrideOfficialDifficulty=6.00

I previously had the OverrideOfficialDifficulty set to 5, where I would ony see max level 145 dinos, upon changing to 6, I began to see max level 180s (my target max level). With the weight values set to their defaults (not 0) as well as OverrideOfficialDifficulty of 6, I was still experiencing the level cap at 145. I am not sure what these weight values do, and also unsure of why setting OverrideOfficialDifficulty=6.00 gave me the expected levels of 180, as the mod author states that your MaxLevel ini line should be determined by dividing your difficulty by desired max level ( aka 6 / 180 doesn't equal 36, it equals 30).
If you desire higher levels than 180 I would suggest following my steps but replacing OverrideOfficialDifficulty with a value that is one number higher than your target level's divisor.

Hopefully this can help you guys fix your level issues, I was bummed to see this mod wasnt working. Here are my ini lines for complete context:

[ServerSettings]
OverrideOfficialDifficulty=6.00
(rest of serverSettings section)

[CustomLevelDistrib]
MinLevel=1.000000
MaxLevel=36.000000
WantsEqualLevels=False
WantsRagLevels=True
WantsHighLevels=False
MaxDrakeLevel=38.000000
PreventTitan=True
PreventBee=True
MaxDeinonLevel=30.000000
MinDrakeLevel=1.000000
MinDeinonLevel=1.000000
MinMagmaLevel=1.000000
MaxMagmaLevel=30.000000
LowWeight=0
MediumWeight=0
HighWeight=0
TinyWeight=0