This is a bit irrelevant, as you must use T/T or K method, so not much possibilities of big lead in epsilon....
As per more than 4 degrees lead - it could be due to unguided flight of missile (until hitting the strobs on >2.1 km range...
In Epsilon in case of H<5, the boresight is moved down electrically by 3 degrees. If I consider +-4 degree of elevation lead from the mechanical boresight, than in H<5 the lead can be -1 .. +7 degrees from the electrical boresight.
Hpasp Free SAM Simulator, "Realistic to the Switch" (U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.) http://sites.google.com/site/samsimulator1972/home
