I haven't pulled apart one of the outlets yet so for now I'll assume they used stranded wire.
The OP said he "ran some romex" to his new outlet. Unless he had picked up and used some special romex somewhere I suspect that romex he used would be solid wire. You see any long term problems if it is?
Thanks for the electrical 101 lesson, but I should be OK. I was a carpenter and installed hundreds of kitchens in a past life, so I have tickled plenty of wire before. I know enough NOT to be dangerous.
shorts and electrical work don't mix, electrical work is much like welding and cooking bacon, NONE should be done while wearing shorts