Turn ticks are weird. They don't function the way you'd expect from math. I can't explain better than that.

skills can upset the apparant chemistry, maybe some tinkering with speed is involved

https://ayumilove.net/raid-shadow-legends-crossbowman-skill-mastery-equip-guide/

It's not that. It has nothing to do with speed boosts or skills.

Turns in Raid don't work the way they would in other games. Because of the way ticks work, you can end up getting fewer or more turns than you'd expect.

Well here he is: Hunter with Turn Meter video

https://www.youtube.com/watch?v=Seuw5HU_Tm8

Good Luck!  Way over my head!

Ok I understand it... now can a nerd please datamine raid to find the formula?

a guy named deadwood jedi has a calculator to speed tune champs, that does all that stuff but I think it was developed mainly for ClanBoss

https://www.youtube.com/c/DeadwoodJedi/videos

not my cup of tea but good luck

https://www.deadwoodjedi.com/arena-calculator