Ouch... That's nasty man, I know the feel...
Bben's is right, hydrogen peroxide is excellent as a deterrent for these creatures. However, you might want to consider a follow-up application conisisting of the following:
1 tsp Dr Bronner's Magic Soap, Pepperment
1 tsp ORGANIC vegetable oil (canola, anything works)
Put that in a gallon jug of water, mix well, put in your sprayer and get it going. Since you're so early into flowering, spraying this solution won't harm the taste or quality of your buds, but it will dry out those little shits hardcore. I would use the peroxide and a few days later follow it up with this peppermint solution. Make sure you spray thoroughly, especially on the underside of the leaves where they like to hide, but don't soak the plant too much, just a nice misting. Continue that pattern until the spider mites are gone or you see real buds forming, and maybe lay off the pepperiment and focus more on the hydrogen and some plain water mistings. Also, little tip, before you spray you should shake your plants a little to make some of the mites fall off, or even use a vacumm cleaner (if it'll reach outside) with a soft brush attachment to suck some up, and then apply your spray. Isn't going to make a drastic difference, but it'll help.
Also, look into predatory mites that eat these nasty shits, they're a little on the expensive side (I think it's like 50 bucks for a suitable amount if I'm not mistaken). They're better for indoors, but they'll definitely assist you outside too.