So I created enclosure for my TAZ4. It made ABS prints a little bit better, but still not perfect. It still curls. I measured about 90F inside chamber when using 80C for heated bed. Going higher with heated bed makes prints worse.
So I went ahead and bought 250W infrared lamp in Lowes. Curling went away completely! But I got other issues - it was clearly heating it too much and not quite even. So next what I want to try - 150W lamp and control it via second nozzle heater. I already found solid state relay, which can be triggered by 24V to control infrared lamp, but I was wondering what I need to do to be able to change second hotend temperature independently from bed temperature (right now both seems to be coupled)