I assume you're using the stove made for the cone, but at that much water you may be past the point of diminishing returns.

What brand denatured are you using and is it fresh? You might try some Yellow HEET just to be sure.

I assume you're using the frypan lid?

The titanium also doesn't help in this case since it doesn't transfer heat as well as AL.

If you still can't get it to work, I'd remove your drink water from it and boil just your food water first and then boil your drink water while letting your food hydrate. 2 smaller boils are usually more efficient on fuel (if you don't have to prime any) than one bigger one, regardless of stove type. I've had a Windpro that couldn't boil 3 quarts when I was testing some worst case stuff.