Looking Good 

That grain noise is a little issue so it seems still to be there with optix?!  The shadow is not blurry due the distance of the wall. the closer the wall the sharper it should be, that is a simple light setting same in RL . Your render time is good doh, Did not have time to figure out where I got a problem with Optix. That grain reminds me on old times when after midnight they shut off the tv channels , then you also had grain on the screen :)  The first frames seem to do well then all of a sudden the grains jump in , must be a hiccup.

Got to get my graphic card running in poser so I can see if I can get that crisp off  even if it then takes 4 sec a render that  sure would be fast, 6min for 90 frames ! Cool ....

Might be good motivations for others when they see these animations. so actually "you do not help me" you help others, and motivate them. " You sure Remind me a little of Rodney McKay in Stargate Atlantis "