Each of your cards is very polite, well-written, and professional looking.
Alex32817 said:
When the EV if done charging:
https://flic.kr/p/ocPXDf
This is fine, but frankly I think it is unnecessary. I can't imagine anyone feeling insulted if they come back to their car and find it charged to 100%, with the plug now in someone else's car. Frankly, if it is a pay-to-charge station, they would almost certainly be grateful since you are saving them money by unplugging them when they are done. (I know that Blink stations charge you based on how long you are plugged in, not based on how much actual electricity you use.)
The card would probably make them feel like you are extremely courteous, so it is only a good thing. But I just think you needn't bother.
Alex32817 said:
When their EV is charging, and I am asking for their port once they are done/leave:
https://flic.kr/p/ogCUAB
This is polite and courteous, but I could see conflicts arising from it. You are essentially trying to reserve your place in line to charge from that spot. I find it to be very sensible, but other EV drivers might not.
Example: What if, when the currently charging driver gets back to his car (and you are not there but have left him your note asking to be plugged in) there is another EV driver waiting on his spot? This other EV driver doesn't know about your note, and may not even recognize it as a valid claim on the spot. From their point of view, they are there, you are not. Now the currently charging driver is put in a position where he has to decide to plug in your car, ticking off the driver who was waiting for the spot, or let them plug in, potentially ticking you off. Not really fair to put them in that position. The etiquette in that situation does not seem to me to be universally agreed upon at this time.
Now, that said, if I returned to my car and saw another EV parked within the cord range with their charge port popped open, I would definitely plug them in (assuming the EVSE was free and didn't require pay-activation to start charging. . . in that case I would just put the plug back on the EVSE). But if another EV was waiting behind me with their blinker on, and a car full of kids? I might just ignore your card and pull out.
Alex32817 said:
When an ICE car is in an EV spot:
https://flic.kr/p/oeGaZQ
This is well-worded and not insulting. But I'd think carefully before using it.
On the plus side the driver might be a reasonable person who was just oblivious, and your card will make them think twice next time.
On the negative side the driver may be a nutcase or anti-EV jerk who sees your card, notices the unattended Leaf parked nearby, and walks over to exact some form of retribution.
I'd probably use it if the ICE was a prius or a civic. I probably would not use it if the ICE were a lifted pickup truck with "drill baby drill" bumber stickers.