Before the KMJ I ran a J2Fab with this same wire upgrade and it made 14+ at idle from day one. So I don't think it's the wire set up.
I drove the car today and I saw it dipped down to 12.7/12.8 volts after the car was warm and I was at a light and the fan kicked on. As soon as I tapped the gas it shot back up to 13.4. Cruising around it was 13.8 once hot. I’m gonna continue to monitor it but I’m still breaking in the clutch with the motor on a break in tune and I haven’t had much time to drive it, and the weather here is still crappy at times.
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I would check voltage at the battery and compare against the gauge, the obd2 port frequently reads a few tenths less than actual. I wouldn’t concerned about 13ish at hot idle
Cruising I would see mid 14's. That was with a/c and stereo going. You're probably not horrible, but I'd still keep an eye on it like you said.