Sorry to hear that. You're not alone though, I had trouble with the exact same area of the kit when I built Eduard's A-8. When I finally got it done, I sold the A-6 I had in my stash. I'm quite happy how it turned out in the end, but I think it's just too much trouble.
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I guess it just requires VERY meticulous care with the subassemblies that go in the front fuselage in order to go together nicely. It felt like it only took one bit to go slightly awry and soon it was all messed up.
I had trouble with the fuselage gun compartment, MG ammo boxes interfering with the main U/G bay, engine mount system (I ended up ditching the delicate mounts and just made a crude bu effective mount out of Milliput), the gun compartment cover, the canopy parts' fit to the fuselage... you name it.
In case you're interested, here's the Fw 190 Campaign thread with my build updates:
-link- (link leads to thread page where I started my entry)
Fortunately Eduard responded to the criticism they got for the kit being quite tricky to build, as the Hellcats that followed were engineered with ease of assembly in mind. The first release F6F-3 I've built went together with almost zero issues. (no
pun intended.
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)