Oilpan gasket and torque?

[Dad Was A Racer]

Assembling my 8BA further tonight and finally getting to install the oil pan. Following the instructions in one of my "how to build the world's most awesome flathead" books, I put Gasgasinch on both sides of the gasket surface and torqued the nuts (I'm using studs and acorn nuts) to 18 lb.ft.

On about half of the bolt holes, the gasket has obviously torn in half and pushed out the side of the pan.

What gives? Is the torque too much (seems like a lot for an oil pan to me) or the Gasgasinch making the gasket mushy causing it to fall apart, or????