i really like the Hasegawa AD. Shame you don't see more of these built up; it's an awesome little kit, just like their A3D.
if you haven't tried it already, may i suggest using Mr. Surfacer 500 and a Q-tip with Mr Color Thinner. it works awesome on 90-degree angle joints like that found on your F9F (which BTW looks like an awesome little kit too!).
What went wrong with the EP-3? from the photo it looked pretty good.