I can understand the frustration. 109F4 and K4 are my two favorite birds. I have found that it is necessary to change tactics to defeat the "Horde Mentality" and it usually starts with a little extra patience and fuel. Nowadays i roll my K4 with 100fuel and sometimes a drop tank depending on the time that i have or what i am anticipating. If i see the "horde" coming towards a base, for example a cv near a base, ill up my k4 and grab alt and just pick them off, because what else can you do? Dive in and turn with them? Oh yeah that's happening. Other times ill come across that rare 1v1 pilot who I don't know if he is good but soon find out when he doesn't decide to shoot at me from d800, those make it worth it. The only disadvantage with that is you have an incredible amount of fuel onboard that limits the abilities of the 109, but it's still fun.