My best score in a slow plane was about 14 or 15, in my deeply beloved FM2. Couldn't land them though, the carrier was gone when I had to return. I admit is was mostly vulching but on a good day I routinely fly 3-4 kill sorties in it. Maybe I should try to get a 10+ streak by reloading (I like to swith planes al the time) but I have to face that I'm not good enough.