against awarding greater potions.  There are some missions that are meant specifically for a player to convert enough greater potions into 10 superior potions. That is turning out to be a huge undertaking for me.

The potion keeps show that greater potions are available beginning with level 4.  Going up through the levels, and best I can do is L15 on Magic, I receive very few greater potions compared to lesser and superior.  Here is a picture:

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Normally one would not complain about receiving many more superior potions, but in this case it is a bad deal. I looked at the potion drop rates for all the levels and it seems to me there should be more greater potions awarded.

So my question is, are the greater potions being suppressed in some way?

I know the canned answer here is to do L20, where the lesser potions disappear and there is about a 2/3 to 1/3 chance of greater to superior, but is that really true?  Atm I am not able to do L20, so I do not know what it looks like, but can anybody tell me whether or not the greater potions actually increase at L20, based on experience?  

Mod Edit: Title changed to better reflect content of thread