The heater lead wires are only 18 AWG, which is really too small. I probably will solder in one or more parallel leads. I think replacing with a single heavier gauge wire might cause it not tolerate the movements?

The thermistor readings are good. During my build, I stuck a fine wire type T TC on the underside of the bed to use for confirmation of the thermistor readings. The TC responds much faster to the heater, but always reads within 4C of the LCD display.

Jim