Me and guildies have much experience in this field.
I personnaly came to this conclusion today, I might add: (even Ambush wasn't hurting me alot)
Solo, plate or chain with ee is better.
You're facing one monster at a time, either monster's melee or caster.
Cata's, scale or leather with ee is better.
You're facing many monsters at a time, wich are casting or meleeing against you.
Balance is best I believe in cata's, I rather keep these to myself but since theres a thread about it.
I'll share this info to help some of the ppl who still ask me and others with sick ee scale/leather to go to M

Depending on your ee of course.
With my armors and guildies, we always stay in Front and even the ppl with over 100 ee chain/plate that we ask to go M, get the double more dmg then us in F.
Today, even the ppl in back had more dmg then me

It's the truth, ya'll can ask around if you'd like

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Chains/Plates have 0 as a minimum, in my opinion that 0 really diminishes the avg,
wich to me even if it's 0 - 300 = 0, and not 150.
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Anywho, thats my 2 cents about this secret wich is now also out thanks to me
