The odds are uneven.
The british have one sherman and 2 mortars.
They have to fight 1 PZIII, 1 Marder, 2 mortars,1 Lefh 18, various PAK guns, many MG positions...of wich few can be used against the germans
Withouth spawnable AT Kits this is just impossible.
My suggestions=
-Add a 25PDR. Allied artillery was far more numorous and better then german. Many maps just have stupid mortars(villers bocage, Luttich and so on)
-Balance the use of tanks. Add more shermans( or churchill :v:v:v:v:) or let the german tanks spawn later. Or remove one of them.
Other then that, port en bessin is a beautifull map.