How long in fridge?
And I can tell you based on first-hand experience, assuming those pre-measured pouches to be pre-measured correctly can be a mistake! On the one (yes, one) batch that I bottled, I used the pre-measured packed of priming sugar. And I wound up with an even dozen bottle bombs before I was done! Not cool!
Now, it's possible that more time in the fridge is all that's necessary to allow the CO2 to get fully into solution with your beer, and that you'll be fine given another week or so in there.
But if not, what I can suggest is this: Take a bottle opener and just lift the edge of each cap enough to let some gas escape - don't actually open the cap! Just let some gas out. Put the beers back in the fridge overnight, then check one the next day. If it's still too foamy, repeat the process again until you get back down to your desired level of carbonation.