Those 2 aov's are my go to, in combination with direct_component and indirect_component. With these aov's you can identify where your noise is (ie, direct reflect, or indirect_refract, etc) and see how many samples are currently being used. If you're not reaching the upper limit of your max direct samples in noisy areas, decrease your noise threshold value to force mantra to sample that area more. If you are reaching the upper limit of your max samples but noise persists, then increase the number of max samples. It's definitely a balancing act and something you'll gain a better feel for over time.