Bot use 2 pots - health or mana

[nizlov]

hmmm no..

so the perfect is 1100?

I don't know what value is perfect, it depends on situation. But there is 1 second (1000 ms) exhaustion after using any potion. However you won't notice difference between 1000 and 1100, as it is 1/10 of a second.
Delay of 300 ms means you are using potion 3 times a second, so I think it is the reason of using 2 potions instead of 1.