[JThiessen]

Welcome to RCM.

1) No
2) 3.4 is quite high - so shouldnt be a problem at all.
3) Absolutley.

You'll find quite a bit of disussions that have occured regarding reasons why packs puffed. Lots of speculation, 'cause unless these folks were right there with you, its hard to see and know all the facts. If for some reason you want to chase down the possible reasons your packs may have puffed, you'll need to provide more data, such as gearing, tires/wheels, how you were running it (always subject to individual users own pucker factor), charger uses, how you balance, etc.

Did they both puff at the same time? If so, there was another instance of that happening last week. You'll find that thread in the "general forum".