i hit stage 14 drop rate is way better than that of stage 15 even 13 has its days where drops plenty of top bottles 

15s drop rate is a joke shards and lessers on tap i stay well clear of those floors 

I agree lol

Once I spent half an hour multi battling (lol) and only got 3 big pots (all 30 multi battles) and then I did 1 alone and got 2 tops

I know it's been said before but yes, the random nature of this can be frustrating.  I did 10 runs yesterday to top up my superior force potions in preparation for this fusion event and got 6, which was ridiculously fast.  Meanwhile, I had done over 30 runs on another potion tower a few weeks ago and got none.  Sometimes luck favours you, and sometimes it doesn't

I tend to think conspiracy theory.  They can sense what you want and chain up the gates to get that.  IMO, potions are the biggest ripoff in the game. 

This is simply confirmation bias. There is absolutely zero reason why Plarium would program the system to give inferior rewards at a higher level.

800 and you got 3 ??

 I did 1500 Energy in Spirit and got ONE Superior Pot ............

Now I dont do more then 300 energy in a day in the keeps