There is something I've noticed. With the short ingot cool time, quenching isn't even necessary. By the time you get the tool head to the beach and start out to put it together the head has already cooled. I don't know what the best method to deal with that might be, but the days also seem fairly short. Maybe stretching out the day a bit?
*edit*
After a bit of experimentation, I've also discovered that putting head on a grip will instantly cool the head and attach it. Dont know if this is a bug or intentional.