Larry,
I’ve given up on that acrylic case. All the real geniuses here @9a4db and others are having great results with Aluminum cases. I’ve just ordered this : https://smile.amazon.com/gp/product/B00TJ49K4U/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1. See his waveforms versus mine at My Lime seems completely deaf