www.nthba.org

I recently discovered that two batches of strong beer I bottle conditioned and aged for 3 months have insufficient carbonation. These were my first two batches using the new "malt tablets". I followed the dosing rate suggested with 7 for each 22 oz bottles. They were kept at about 72 F during conditioning. Any suggestions on recarbonating?
Re-open and add additional tabs?

Just to make sure that your priming addition is spent, you could roust the yeast from the bottom and warm the bottles to about 80f for a week and see if you get more carbonation.