Ravel, I would order some better wood. Also, wrap your foil tight around the bottom and sides of the chunk; yours looked pretty loose. The idea is to keep the air from the bottom and sides (where the intense heat is). The only way you'll probably ever get the Weber chunks to not combust is to wrap them completely in foil, with a couple of holes in the top.
Check out fruitawood.com and mainegrillingwoods.com - great wood.
Tight foil on the bottom of good wood and you'll never get the belch again!
As for the brining - Yes, a simple salt water brine accomplishes the same thing. I, personally, can tell a big difference in the meat that has also been infused with different flavors, like garlic, onion, rosemary, citrus, etc... It's all a personal preference, though. Maybe I missed it, but what brine recipe did you use?