So after going back and assessing and taking your input, I've made the switches of the basin-wide to west-based for those years. I think before I may my list final, I want to do composites of OLR and see if that can help aid in any guidance.
I also am thinking of coming up with a breakdown for SSTA's off the West Coast. There are a solid mixture of events with significant SSTA differences here and my inclination is that could be a significant player. The same can be said for Nina's.
I was looking into the Trans-Nino Index, but TBH, I don't truly understand it and some breakdowns I was doing with it made zero sense.