Not succumbing to various levels of stun or kill just means Yuta isn't your average humanoid. But not succumbing to setting 8, the vaporization of matter, would mean Yuta isn't made of matter!
I don't see the reason for overkill beyond
setting 8. Especially since there was an immense risk of collateral damage, with important political figures around the table and a lot at stake with keeping them alive and well.
This is why the 16 green lights don't give me quite the level of satisfaction a treknology nerd like me should be getting here...
(However, the previous settings at least make great sense. The first would be some sort of standard or heavy stun, the same Riker has already used on the Gatherer henchmen. The second appears to be something like Level 5, which the TNG Tech Man equates with "thermal effects" (kill or at least seriously maim but without vaporizing).