BTW don't expect from HARM to hit enemy SAM at any cost...its not some kind of magic weapon. Yes, it needs some fixes, but it will be very unrealistic to always hit the SAMs. I think HARM model is very well done by ED. I offer you to read more about NATOs bombing of Yogoslavia - operation called "Allied force". As you know, Serbian Air Defence shoot down F-117. Division, which shoot down that aircraft is called "most successful division in the world" - 3rd division/250 air defence brigade, armed with old SA-3 Goa system.
So durring the war, there was 23 (!) shoots of HARM missiles against this SAM site, and...0 (zero) hits...