Force Carbonation

Brew 8 has completed fermentation and lagering, it doesn't taste that great yet, but hopefully it will come around during bottle conditioning?? I am trying to force carbonate for the first time. I used a carbonation chart which tells what psi to apply to the beer at what temperature to achieve the desired level of carbonation. Pilsners typically have 2.4 volumes of CO2 and I am keeping it at 40deg (F) so I applied 12.5 PSI and will hope for the best.