I do agree with you that the Ju188 would be my choice, and with a 20mm MG151/20 in the top turret it isn't even that badly gunned.
Now... Was this turret of limited rear angle use, or was it 360 all the way around to the front? If so that would make a very powerful defensive tool. The MG151/20 is no slouch. Not to mention there was a 13mm right behind and below it. You'd have 2 guns hitting rear targets.
I don't think the 388 really counts. More of a "didn't really make it in time" bomber, and with a limited payload. It was fast, but very few were made.
Originally the first pre-production versions were 388Ls, with about 35 being made (some converted from Ju188S models). These carried no bombs, only cameras and aux fuel tanks.
The 388J never had any leave the production lines before the end of hostilities. This night fighter variant would not have had the tail guns, but it would have had a large ventral gunpod with 2x20mm and 2x30mm guns. Again, none made it.
The 388K bomber version had 10 pre-production test models and prototypes made, but before the war ended only 5 Ju388K-1s rolled off the production lines. Chances of them actually making it to front line units and seeing combat are slim to none.
IMO that plane doesn't work for AH. Ju-188 does a far better job.