At i192, DRAC pots are roughly 10% DPS increase in burst, but, 1+10%*15/270 = 1.00555555555% overall DPS increase, per Potion application.

At i192, X-Pots are roughly 8.4% DPS increase in burst, but, 8.4%*15/270 = 1.00466666666% overall DPS increase, per Potion application.

A 10% increase in your Strength, is literally, a 10% increase in damage. Use my Damage Model on the OP if you're unsure.