S!
I have no problem with flak on ATAG server. As stated above plan your attack so the exposure to the flak is minimal and as it takes a while for them to "wake up" = get in and out fast. Doing so you are most times out of harm's way when they start shooting, at least the Bofors
Heavy flak is just a nuisance pointing out your general location. If you enter a target with someone already on it then you can be sure flak responds faster as it is already triggered. Or am I wrong?
Another thing is that if you vulch then suck it up when dying
Flak is awake and waiting by then and you are well within their engagement envelope while circling the field at low altitude and slow speed.
Thanks ATAG again for enjoyable moments
Was fun!