Hai guies~
Iron Tarkus here. I have T2 experience with these enemies.

Devilite

• Will dodge towards the direction of bullets shot (if it's not doing anything else). You can either fire ~1 block to the right/left of a Devilit with a Blaster, or use it to set up a melee attack, or whatever you fancy.

e.g. Shoot Blaster to the right of a Devilite, Devilite dodges to its left (your right).

• If the Devilite does that shrink away animation, it will jump away. If you prematurely follow it to its landing point, you will likely get some stuff thrown at you (possibly mid-jump).
• The best time to attack is right after they throw, because they have action cooldown. Baiting attacks works well.
• Pit Bosses are your friend against Devilites, they will hold Devilites up with fear of overworking and you can pick them off as they change into Overtimers, or as they try to escape from the Pit Bosses.

Overtimer

• More likely to use that slow melee attack if you're standing near
• If they're moving towards you when they're within throwing range, they're going for a melee attack unless you move away, then they'll just throw
• May randomly dodge once and attack
• There appears to be two criteria for Overtimer rapid dodging: proximity to player and how far away the Overtimer is from your view(aka get behind you)
  The proximity to player trumps getting behind the player. Overtimers will try to keep their distance from the player and then try to get around to their backside.
• The side dodge of Devilites is also applicable here

Greaver

• Will rush at you in a straight line initially aimed at your current location. (If you sidestep slightly it will wrap around to your back)
• Anything that deals damage numbers will interrupt a Greaver charge

Useful sword tactic which adds an extra first attack for swords (per combo)

• Heavy Swords (2hit combo): Attack > Shield > Attack-hold > Attack-release > wait a moment (for combo cooldown) > repeat
• Regular Swords (3hit combo): Attack > Shield > Attack > Shield > Attack-hold > Attack-release > wait > repeat (alternatively skip the first shield cancel)

I personally favor this method over double-switching because I fail at that, and you can get two 1st attacks without accidentally shieldbumping (by holding and releasing at the end of the attack combo).

Gorgos

• Attempts to attack left or right or straight depending on if you're running around it or not, but in practice, this doesn't happen at close range as the Gorgos' random left and right movement also influences their calculations. At decent range, it might act correctly according to your movements.

Left or Right attacks are characterized by Gorgos floating left or right as they are readying their chomp attack. If you see them doing this, move the other way and it's an easy to sidestep.

• In T2, taking 1 block step back when the Gorgos is at normal stalking range, will make it so that you won't get hit by the double chomp
• Trying to shieldbump Gorgos mid-chomping is not a good idea. You rarely take no damage for doing it. It is a better idea to shieldbump before they start chomping and step back if you're in T3

Of course, you could just use a Blitz Needle and roflstomp everything.