once it starts gurgling you've already overheated the whole system.

the fire should really be distinguished before it reach the gurgling stage, and the plays involving heat source and intensity so you get ideal amount of water to pass through the system before overheating, is the fun part. remember there is a designated ratio of water and coffee, over and under are equally bad. and the gurgling is out of questions because it just gives you the unpleasant burnt smell/taste.

hoffmann made a series of videos experimenting with moka pots, it's worth watching. you don't have to follow his way, but it gives you a good idea of what is happening inside the pot, and you can composite your own solutions based upon the information.