Bloody Longinus: too risky with 7?

Hello guys, so i bought bL in order to have a chance against hS combos and other left spinners in general. It's teeth are good, not awesome so i was wondering: is 7 a safe choice for it or 5bump is a better pick to avoid self-bursts?
Bloody Longinus' weight means that a heavier disk will barely effect Burst resistance, so use 7
Use 7 bump
7 is better than 13