yeah guy above is right, i'm in the same boat as you, can only go on fridays and weekends, year 12 bites :wall: but anyways continue using sumoa and duradel on your 10's, but yeah i wouldn't use anything lower then chaeldar (fairy guy) for your 9.
actually his name is lapalok or lapolak, but anyways if you want to make decent profit off of slayer rather then from buying slayer dart runes better off block four annoying tasks with duradel/lapolak and sticking with just him like i am. seems easy enough to me. but anyway just experiment with dfferent masters to find something that suits you, everyone is different. goodluck slayering :D