I'll make 6 jars of relish from that (I hope). 3 hot and 3 WTF....are you trying to kill me.
You should definitely grow your own peppers. Jalapeños won't yield any WTF punch. Grow some superhots--fatalii, bhut jolokia, Trinidad scorpions, or even just habaneros--to add to your brew. Get them planted now; they're all late season, and so won't be ready to pick till August.
I find that most of the jalapeños I buy nowadays are barely mildly spicy.