Posting this here in case it can help others in the future.
The mixer on our Form 4L moves so fast that it really whips up Elastic 50A in the tank. This introduces a LOT of bubbles and froths it up. Surprisingly this doesn’t introduce part failures, but it ends up trapping bubbles inside the part, which end up making parts less optically clear.
The solution to this is to lower your wiper speeds. Below on the left is with Default settings, and on the right is with the wiper speed halved. There are still bubbles during mixing, but it’s significantly better without compromising speed too much. I know bubbles can probably be eliminated entirely if you lower the speed further.
Hope this helps someone out there who encounters this like I did!
Cheers.