Actually nothing can fix the Atlantic campaigns in either SH3 or SH4 because they are missing the central aspect of German submarine strategy in World War II: the wolfpacks, with their communication with Admiral Donitz coordinating multiple U-Boats to a single attack point. The Atlantic without wolfpacks is about as realistic as the Pacific without water.
However the gameplay aspect of SH3 is fun and fairly robust. It does still have the defect that kicked me permanently to SH4, the ability to forget your campaign completely because you (choose one or more) saved while in contact with another entity, saved submerged, too close to land, did not face Mecca or didn't chant the correct incantation. I found that just awful and insolvable.
So I bought SH4 and never looked back......except once in awhile. SH3 has an atmosphere the SH4 just never caught.
As far as the SH4 supermods, they are carefully crafted NOT to replicate the bloat of GWX. However, if you want something darned close, try Fall of the Rising Sun. It is truly the closest to GWX that you can get in SH4 and is just an excellent mod.
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