@sharkb8
So with drop cookies, you drop by teaspoonfuls, is that correct? And you want them to spread more.
In that case, flatten each one a bit with the back of your spoon, and see if that helps. But I still wouldn't chill the dough for that long.
I don't even think you need the lock n' lock unless you do not want other odors to transfer. I'd just use the plastic wrap. I've never transferred my cookie batter into other vessels. Just kept it in the mixing bowl, plastic wrap over.
(I only use butter, as well.)
Anyway, happy baking! Not sure if I'll be doing any baking this year.....my DH just went up a pant size!