cocorico, it's possible the lowest settings on your oven are inaccurate, and by quite a bit. Very often it is the case that an oven thermostat is accurate in the 275-400
o range but be wildly off lower down.
Also, ovens (whether gas or electric) are "all on or all off"
devices; unlike a rangetop gas burner, they're incapable of gradation. Thus, when you turn on your oven, the heater fires up "all on" until the thermostat tells it to turn "all off" when it reaches the desired temperature. The thermostat may not actually be in the oven, or your oven may have much hotter spots than where the thermostat is located. Finally, many ovens are programmed (mechanically for older ones, digitally for newer ones) to overshoot the desired temperature, sometimes by as much as 50
o, to keep the average temperature over time at the set temperature.
Long story short: ovens are the absolute
last place I'd ever dry a freshly laundered carto! Air-drying over several days seems to be the best and safest course.