Built three of models over the years one converted to an F-190. Each one had the same fit issue that you are experiencing. If I recall the side pods don’t line up correctly with the top half so I’d take a look there. Also make sure the bottom nose section is lined up as I recall it’s somewhat off. A few modelers ended up using small magnates to more or less hold everything together.
Sorry that I couldn’t give you fool proof solution. Also if you haven’t already I’d suggest getting some different decals. Unless Tamiya changed the decals the white at least is almost transparent.