Base turret stats:
Stats after adding Laser compressors to max: (about 4000 less damage /s)
Stats after adding a few laser heads: (note negateve damage /s)
Stats after adding more laser heads: (note damage /s value no longer appears in stats window)
I don't think there are any logs that will help with this issue, but if I'm mistaken let me know and I can provide whatever would be helpful.