Filesystem load to RAM vs piping

Looks promising - but maybe try:

digitalWrite(A14,0); // power off
digitalWrite(A13,0); // boot mode
digitalWrite(A14,1); // power on

Serial2.setup(115200, { rx: A3, tx : A2 });
Serial2.on('data', function(d) { USB.write(d); });
USB.on('data', function(d) { Serial2.write(d); });
Serial1.setConsole();

I think you set the boot mode after powering the device up?

Are you sure you're disconnected with the Web IDE?