For me the mg 131 on the A8 is all but useless, likewise the 7.9 on the A5.  I only fire off the cannon rounds so that I can see the hits and decide on how damaged the adversary might be.
Possible combinations of loaduots that were used on FW 190's
4 MG 151/20,   MG 131 removed
2 MG 151 2 Mk 108,  MG 131 removed
6 MG 151,  MG 131 removed
6 MG 131,   MG 151 removed tested and used
2 MG 131 2 Mk 103, MG 151 removed 
4 Wgr 21 cm rockets
I also have pics of the D-9 with 4 MG 151, 2 MG 131, and a centerline Mk 103 if needed. 
One other note is the Minen Shell used on the MG 131? M Schloss or however you spell it.  It should be there, if not I have sources to prove it was used.  One other note, FW's were notorius for short runs with high weapon load outs like the F we have in here now.  Will additional options be made available for the FW's?