I have now full attendance with 16 and 17.
League: first possible bonus above 0, raise league bonus against strong opponents.
CL and Cup: raise bonus as competition progresses and as you need. I often change bonuses in cl and cup. For example, cl group stage-if I have secured 1st position, then I decrease bonus for last match or 2. If have fair advantage from 1st match in knock-out stage, then I decrease bonus before 2nd.