A-8 and F-8 have 100% identical climb and speed stats. It's an issue I've pointed out before. Our F-8... isn't. Not to mention our A-8 is NOTICABLY overweight, like flying with 500lbs under it at all times, and this is probably screwing with acceleration, climb rate, and top speed as well. The outboard 20mm and 30mm are BOTH way off the normal weight when empty, one high and the other low, and in general if the A-8 were as it SHOULD be, it would be quite a bit more competitive (more akin to the A-5 I would say). I was under the impression the A-8 is running at more horsepower than the A-5. We get the weight issues fixed and maybe we start seeing benefits to using the 8 vs the 5. (*shrugs*)
Calling the A-5 manuverable is like calling a Ugo fast. It's all too relative. The A-5 is the "most" nimble out of the WORST planes in the game. Its turn radius is about 790 feet, as compared to the A-8s 874 feet (I believe that's with 4x 20mm on the A-8).
Compare that to this sampling of very common planes in the LWs:
(noflaps/flaps)
F4u1d: 702/427
109K: 703/533
La7: 617/453
Spit8: 568/448
P38J: 817/598
F6F: 649/465
109G2: 636/467
Ki84: 595/445
Note that using flaps in a 190 in a turn fight is a death sentence, so I won't give you unhelpful numbers by posting flaps' turn radius for the 190s and pretending they make a difference.
The A-5 is not competitive with ANY other plane classified as "manuverable" in regards to turn rate. It may feel like it because you're coming from "horrific" to "just plain terrible" and you can feel the difference between the two.
You want to really dogfight a 190, you have to learn to do it heavy. I almost never take less than 75%, and often take 100% (if not 75%+DT). You're almost NEVER going to meet the enemy with 15% fuel in your tanks. Let's be honest, a LOT of planes do some "wonderful" things when they're flying on no fuel. Try the same things at 50% or more and you plow into the ground. With that said, the weight of your entire MG/FF package of outboard guns is less than the weight of 25% of your internal fuel load. (139 gal = 832 lbs, MG/FF + ammo = 196lbs). Your fuel weighs more than your guns.
If you're freaked out about weight, fire off all but 100 rounds of your 20mm (saves you 194lbs), dump all your 7mms on the runway (saves 117lbs), leave the ETC rack at home (weighs 130 or 160, I can't remember), take off with only 25% gas (saves 624 lbs).
You'll only have about enough ammo for 1 kill, but you only have about 5 minutes of gas anyways so it evens out.
My point is if you get all freaked out about weight savings fly a spit. They do it all better. If you want to fly a 190, and fly it RIGHT, you take the gas and ammo to rack up 10 kills in a sortie. How you get those kills and if you make it back is up to you, but there are so many ways of doing it that DON'T include shooting your own feet off to save weight.
EDIT: Not intended to start a fight. Intended to convey my long experience flying 190s in AH and how in their current state going all out for "weight savings" is not the answer to most problems (for this particular plane). I'm not denying that it helps, but it's generally not the best choice in the end. It IS however a choice, and you have to make it.