So, what I did tonight was mix up the remaining 1/4 of the 2.4 oz packet of the priming sugar (I kept it), in the appropriate amount of boiled water (1/2 cup) and let it cool to about 75 degrees. I divided that volume by the number of bottles to get an even amount for each bottle I had. Then, as rapidly as I could, one by one, I popped the top, injected the 3.1 ml of sollution into the bottle, and re-capped them with new caps. I flipped the bottles a few times to agitate the settled bits from the bottom, then rested the cases upstairs where it's 75 degrees, rather than in the basement where it's 68 or so. I think I remember reading that the warmer temps will help carbonate them up better.

Any thoughts on whether this has any hope? I guess WORST case is, I just let the little bit of carbonation pressure out of them all and this new step ends up adding nothing, leaving me with COMPLETELY flat beers. Crossing my fingers though.