While failing at the witness, and attempting to find out better strats, I realized that:
1) A hunter with Still Hunt, the Solar Activity Surge (25%), 2xSolar Surges (17%), Weakness (15%) is hitting the Witness for 48258 damage
2) Me, a Titan with Still Hunt, the Solar Activity Surge (25%), 4xSolar Surges (Spirit of the Eternal Warrior, 25%), and Weakness was hitting the Witness for 41247 damage.
I'm losing either of the 25% damage buffs. 41247 * 1.17 (since both EW and Activity Surge are 25%) = 48258
I should be instead be hitting for 51558.75 damage per Crit.
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They don't stack by design.