Thanks again, everyone.
I just did my second solo, for the Lone Wolf banner and, I have to say, it was a significantly more painful experience than the first solo, though not much longer. I think the main issue was I chose to play on Giant, which I understand is a popular map for doing solos on, but I'd never personally played it solo before.
Two pizza delivery objectives and one drone. Urgh. The first delivery went so bad, I ended up using an ops pack, a medigel and a missile to complete it. I also suffered being staggered and knocked around a lot more, this time. I understand the Kroguard has some stagger resistance, so now I know why stunlock pisses everyone off so much. I had one little bastard of a bomber stunning me so it was impossible to reload. Argh.
Still, I kept it together, and by Wave 11, I still had two missiles, one medigel (which I needed) and three ops packs. Just enough to get me back to the LZ with 15 seconds to spare.
JustAnother Vanguard, I tried AP ammo with this setup, but it didn't seem to be making a huge difference in terms of damage dealt. Also, I missed my fire explosions

Those things were great for taking apart a large cluster of Geth.