Okay, edited for the next release.
The "Cum High" status effect should now be able to track the total mLs of cum ingested and level up based on that. The stat debuff values are now tracked with one value instead of three since they are all the same value, essentially. The thresholds are still the same (higher each stage), but at least the progression of the effect will feel more consistent. The effect's tooltip will show the current tracking for clarity.
After the update, if your character already has the status effect, it may act a little weird with the numbers, but after it is regained again, it should function as expected.