It seems like most of our contention is over how we define things, So I'll just grant this:
Cues are objective.
We can assess them subjectively or objectively.
You might disagree with the second point, but for the purposes of what I'm going into, I'll say that objectivity is not important for me, because it's really not but I'm a stickler for fleshing out definitions, lol.
I'm a moral particularist and here's my basic model for morality.
After looking at moral behaviors it seems that the underline theme is harm vs benefit. (whether Subj or Obj)
We can make objective decisions off of this standard.
I believe there are no absolute morals, but rather every situation has an absolute answer.
For example, Murder is not absolutely wrong nor is execution, however, we could say that in situation X, murder and execution are always absolutely wrong based on how we prioritize morals from the harm/benefit standard.
What I am willing to agree upon is that once we add the harm/benefit standard, we will necessarily have to add some extra subjective standards to harm/benefit in order to have a way of prioritizing our moral cues.
For instance, we can't say loss of life is the highest priority based off harm/benefit alone because we don't really know the implications of death for the individual after the fact.
So we have to make a subjective assessment, that people generally don't want to find out what's on the other end right away.
So ultimately, there is a subjective element involved. My main point was simply that the root CAUSE of morals is actually objective and that subjective things "like holy books" are simply piggybacking onto it. However, Objectivity is not required for my moral system.