>> Especially impressive given that Iranian F-14 pilots at the time couldn't get more Phoenix missiles from America due to sanctions

That is correct too. There was a short period in which they were able to get some more during the war but pretty much all they had was purchased before the revolution.

>> so there was heavy emphasis on trying to win engagements without using them.

So heavy that there is a story on how the Iraqi fighter had to eject in Kuwait because he used too much fuel (due extensive use of afterburner while shooting their missile). The Iranians were just trying to out maneuver the missiles shot at them since they did not want to use theirs!