Exploding, during the glaze firing? I've never heard of that happening.
Why do you wet spray the wares? Is it to control the spray application? I don't spray glaze, so that's not familiar to me.
The general reason things explode in the kiln, is due to moisture, which is why it happens in the bisque firing. Bisqueware has no moisture, so it shouldn't explode. Glaze doesn't have much moisture in it. I've put freshly glazed wares, in the kiln, and fired them immediately with no issues. It is possible to have some glaze defects arise, from doing so, but it shouldn't affect the ceramic body at all.
If the body was saturated with water, and you tried to glaze fire it, they could theoretically explode, much like how certain kiln shelves will do the same if they get wet, and aren't dried properly.
However, you seem to be bisque-firing to the clay's maturation point. It shouldn't be that porous, when you go to glaze. So I really am not sure what's going on.
I guess I should ask, what the wares look like. Are they coming completely apart? If they are just cracking violently, it could be a glaze fit issue. The glaze is shrinking more than the body, and the glaze is it to fracture.
Trying posting some pictures, and others may be able to help. I'm stumped.