BTW, when judging the Draken keep in mind that it was armed with either
- two 30 mm guns (A, B, D)
- the ineffective Falcon missiles (hit to kill, suitable only against bombers) and a single 30 mm gun with few rounds (F)
The 30 mm rounds purchased in the 60's did likely have too much delay. Early DEFA/ADEN 30 mm fuses were meant to kill bombers with a delay for explosion inside. This was poorly suited to fighter combat; hits on wings and stabilisers merely punched holes with ineffective explosions too far on the other side. The West corrected its fuses only slowly after the Israelis discovered the issue (and issues with using the radar to support aiming) in 1967.
Many competing fighters were much better armed by the 70's, such as with improved Sidewinder-pattern missiles. The F-5's guns were probably much superior due to much higher muzzle velocity as well (though certainly not at night).
Overall, the first Mach 2 generation of fighters had remarkably poor air combat armament. Too much focus had been on speed & climb rate as well as avionics.