Serial1.setConsole() is not working

it is very low, only 30%, we get the proper data, although using a low baud rate at 4800. While using the hardware serial, we get more than 90% success rate. So, I discontinue using software serial.

Are you using the latest Espruino firmware?
Because there is a implementation of a stable software serial coming with 2.01 see
ChangeLog and the test results.