So I was spamming "Don't Come Back" in order to get enough amber-encased vilekin so I can trade them in for the Anima Weapon quest, and realized that there seemed to be a significant change in either drop rate or chest spawn rate. Over the course of 70 leves I only got 11 treasure chest spawns which equals out to a 16% drop rate per leve, I specifically remember this number being in the 30-33% range before and am not sure if it's because I used to get 2 drops per chest or simply got more chest spawns.

Has anyone farmed Vilekin recently and got the same result?