question on carbinating

[FSCparrothead]

I have brewed a few different batches of the same beer and I add the same amount of Priming suger to all the batchs and have let them sit in the bottle the same amount of time and each time the carbination is different. Heck even in the same brew batch different bottles have very different carbination levels. Any Idea?

BTW: these were brew master pre measured kits, not sure if that matters. Honestly the one batch of beer I did that was not a pre measured kit has came out the best.....hahaha

 

[osagedr]

How do you add the priming sugar?

 

[FSCparrothead]

I was told to stir into the 5 gallon batch once everything was done right before bottling.