I'm like you....bigger the better. A space blanked scrolled onto a couple trekking poles or long sticks makes a huge aperture mirror, with smokey fire makes a hard to miss beacon.

I also carry an audio CD in my first aid kit. With a CD you get reflective surface, a free sighting hole, and when cracked in half, a couple of sharp/pointy blades.

I've heard of a few maritime rescues that involved mirrors....a small, stopped, boat is very hard to spot at altitude.