Yeah broken valvesprings are common on new hemis- even aftermarket springs break, beehives save weight at the cost of durability.

Has the hesitation gone away yet, I had a PCM problem with my 04 when it was new and the new PCM took a few days to learn, for the first 50 miles it would barely run, spit, sputter and stall out, it took about 400 miles to get back to normal, if they reset the PCM it may be the problem.