They poop when they poop. Sometimes they hold it for well over a month, sometimes they go every week or two weeks. Unless the vent area starts to get bloated and firm, don't worry about it. Often times they will wait until they shed to poop.

Get the thermometer ASAP. It is possible you are providing too much heat, although you won't know until you get the thermometer. Personally I would unplug the heat pad and use only the light until you know what your temps are. I assume you aren't using a thermostat to control the heat pad?

I don't really know what to tell you about the squishiness. I mean, I have some snakes that are "squishy" mainly because they are more relaxed when I handle them. If your snake is still small, it makes sense that it would feel this way.