You guys might want to run a 10W-40 oil since it is a jap bike with finer clearances. Heck, according to the chart, if you use 10W-40 oil you are looking at a maximum ambient temp of 110 degrees. At 110 degrees yall won't be riding those things anyway.
The Harley boys love to swill their 60W when it gets to 90 degrees ambient just because they have 1/4 inch clearance on their pistons knocking around in the air-cooled barrels and only have oil to cushion them.
Yall might want to consider 5w-40 Rotella T6 Synthetic