I've probably got the TRK, but I'll describe the issue. There is a timing issue between the step where you idle at WP2 and then launch your ordnance at WP3 while under fire from the rogue Tomcat that turns up.
In my case, here's what I did;
Flew to WP2, and at about 6nm or so rippled two HARMs at the hostile SAMs, destroying them. I immediately rolled left and headed north on HARM launch to reduce closure to the SAMs while waiting for splash.
After splash, I was told to loiter near WP2. So I turned into a looping orbit, with a far point about 11nm north of WP2.
The Tomcat rocked up, did a launch on me, which was easily evaded. I then immediately turned towards WP3, angels 15, 500+kts, full AB, and did a loft release of the JSOWs towards WP3 when I was told to release "NOW".
After the drop I turned towards WP4 and legged it.
After a while, the voice comms and music went silent, and I was then told that my JSOWs had failed to destroy the target and the mission ended. But when I reviewed the Tacview afterwards, something interesting was revealed. My two JSOWs were still inbound, and on a ballistic trajectory that would have intersected the units that were at WP3. They probably had another 10-20 seconds of flight time remaining before impact.
Might need to include a prompt in there to keep the tension going, but extend that timer a little for people who aren't exactly on the waypoint. The timing appears to be very tight.