Effect Coding question

[EnragedLlama]

I ended up working on some custom stuff for my campaign, one of the things is it allows for a increased crit window for certain creature types. I went through the Effects wiki and see that something like is sort of possible but something is stopping it from working and im not quite sure what.

I have currently tried:
IFT: TYPE (human, elf); CRIT: 19
and
IFT: TYPE (human, elf); CRIT: 19-20

Both appear to only be landing crits on 20s, but not 19s. Im looking to make this just something the player can just keep on themselves like most other effects without having to constantly drop it on themselves every time they try to attack.

Thanks in advance!

[Zacchaeus]

You can only use targeted effects in a CUSTOM function and CRIT isn't such an effect. If you look at the effects list in the wiki any effects that can be targetted have a 'T' next to them in the final column.

https://fantasygroundsunity.atlassian.net/wiki/spaces/FGU/pages/884913/5E+Effects+for+Advanced+Automation#Modifiers