I just had a peek at the user manual for the BF-888 and, incredibly, it states that setting the squelch level can only be done in software. Setting the squelch level would be considered a basic radio function that should be capable of adjustment on the radio itself. Unbelievable!
As to CHIRP, the Miklor site suggests that current versions of CHIRP have squelch adjustments under the "Settings" tab, but apparently each radio model is a bit different, so you might have to look for it.
The Baofeng 888 Programming Software allows you to set squelch, but the radios operate even worse when I use their software than CHIRP. From what I read, CHIRP does not support squelch settings on the 888s
Interestingly I had an electrical outage at home yesterday, so I took the time to test the radios without any WiFi or other RFI/EMI coming from my house. The subjective audio quality was better, the static was less, and I was able to transmit from inside to outside beyond 300 feet. However, I still think these are not good enough to use for us.
Failing any final words of wisdom or insight, I'm ready to give up on these.
Thank you all again for taking time to reply and offer suggestions.