I'm glad to see you back in business. You have some of the best 3d breast mutilations out there. I think it's worth the extra render time for that image clarity.
>>4600 and >>4694 look kinda different. Did you apply a sort of film grain filter for 4964? (if it matters for anything, I think film grain filters suck, but do they affect render-time positively by allowing for lower other settings?)