Havent flown the F6 much here in AH but it was my main ride in AW and zeke's were easy meat for F6's in there. The little I have flown of the F6-5 here in AW it seems to be, if anything, superior to the F6 of AW, which makes sense because the AW F6 was the F6-3.
The only time zekes are a danger is if you got low and slow around one with no room to get some E back. Even running into a zeke Co-alt was no worry, just get the nose down, pick up some E and dont give him any lead turn angles. Keep the fight verticle, NEVER flat or going down, always going UP. Zoom through, go into climbing spirals, high long loops, ropes, zooms & hammerhead and you cant lose against a zeke. Even if the zeke gets a few snap shots the F6 can take A LOT more hits than the zeke can. When he break turns, which he will do, you can follow a 1/4 or 1/2 of the turn with him and get a shot or two off, thats all it takes to drop a zeke. If you miss, extend and go back into the verticle. Stay fast and keep the fight verticle, always going up.