12 credit courseloads - how bad?

I'm currently a sophomore applying to transfer

  • freshman fall I took 3 classes (12 credits)
  • freshman spring I took 5 classes but withdrew one (16 credits)
  • sophomore fall I took 3 classes (12 credits)
  • sophomore spring I'm taking 5 classes (20 credits)

How bad does this look? I have a 4.0 and technically 12 credits is still full time but it just feels lackluster. I've read the wiki that course rigor doesn't matter but is this in the same topic/boat?