Hi, I am a new member of the group. Having finished the game both main story and ada DLC on pro difficulty with S+. Not speedrun but still S+.I want to share my experience and info for those who want to start professional s+. Feel free to comment politely and asks anything, i will reply asap. And correct me if i am wrong since i am not "Ada the encyclopedia".

Some info for those who want to complete professional S+:

1. Do not try to always speedrun everything in the game. You are allowed to finish the main game within 5:30 which is 330 minutes. So we have about 20 minutes max for each chapter. Check your time, and loot treasures in the like 6 chapters of the game. like in village, i loot 100% of treasures, in castle , just 80% and in island, i barely loot anything. you guys can check out "Extriaa", and "Aether" on youtubes. i combine both of 2 playstyles for my playthroughs.

2. Don't try to parry anything. Parrying for me is cool, but i only parry the villagers whose attacks are from above, so that i can observe them and time the parry correctly. For enemies in castle and island, parrying does not make them stun so nah. IF YOU HAVE TO PARRY, trick is adjust the camera angle so you can see the attack movement from above, this helps me a lot with parrying.

3. For weapons, i did not use bonus weapons. my main power comes from the sg09 and sr m1903, riot guns and rocket launchers. Remember to buy attache case black (resources L) to craft more flash, rifle ammo, and heavy grenades.

Orders to upgrade:  Dam, rate fire, ammo capa, reload speed.

for example, before the fight with el gigante at chapter 4: my sg09 power is lvl 4, rate fire 2, ammo 2  and reload speed 2. while for the M1903 power 5 ( 4 is ok), rate fire 3, ammo 2 , reload speed 2

why rate fire ? enemies are like super aggressive and fast.

I kill Verdugo, krauser, saddler with rocket launcher. 2 golden eggs for ramon

4. Always watch Ashley when you are speedrunning through areas crowded with enemies, you can clearly notice this in chapter 5, Ashley can run fast but her climbing window and jumping off buildings can be very slow. 

5. if you kill an enemy and they spawn tentacle plaga and you are so close to them. Crouch and then run , you won't be stunned by their tentacles.

6. For ada, my main weapons always is the m1903. i bought the exclusive ticket (25 spinels on ada campaign) for the gun too. absolutely demolishing. for saddler, i use rocket launchers.

That's what i can say for now, actually trying to explore more mechanics and enemies behaviors.

It is best to play the game on hardcore first so you can learn the enemies behaviors and have more experience since hard and pro are pretty the same but enemies are a little bit more resilient and faster on pro.

Feel free to ask and comment politely if you have any troubles of parts or chapters of the game, i will replay ASAP.

Peace!

Some info you may need [or not :) ] for s+ professional