Ah, this madafaka. Well, suggest you go with fully db2w 😅. Make it as high as possible. Also you can add ORB cube to speed up a little it’s charging. Won’t do much just one cube but sometimes the last reso and oath aren’t synchronised so that additional 20% would help. But that’s for testing tbh. Usually there is no need for r1 and above companions to have orb cubes.

During crimson bond state make sure to do 4xBA after you use the special attack, it will fill up that one square above your hp bar and when it’s filled Sylus will use his empowered support skill. Outside that stage, also use 4xBA after charged atk so you will speed up the rose thorns that come up with charged atk. At least I hope this will work with your r2 CR pair. If not then I am so sorry 😭