I feel like you may not be coming up with a modoki composite because your criteria is too stringent and exclusive....ie, are you looking for seasons that did not have any la nina strength (-0.5C or cooler) at all over the central and east Pacific? If you look at the verbiage in my composites, that is a reflection of the criterion that peer reviewed, academic pieces use...like "small cooling" and "weak anomalies" over other sections. IOW, a west based event need not be entirely void of la nina caliber anomalies in regions further east, they just need to be very weak from around 150W points eastward, with the strong emphasis west of 150. It may help to look at the visual SST composites of my three groups for a more vidual representation.