My vote is for the high oil content. Trinity Monster Horsepower with 18% oil? That has to be a break-in fuel, in which case it is too much oil for the engine to get any performance out of. That's the reason it won't reach high enough rpm to hit 2nd gear, and when you lean it any more it becomes air lean which increases the temps.
I'd say try the new (lower oil) fuel and try to retune it. You should be able to lean it out enough to hit 2nd while still keeping a good temp.

EDIT: Don't mess with the shift point in the tranny until you try the new fuel and retune.