I think you meant 14vT nota second 15vT under Hilo.
So Hilo always hits 14vT. The EV for that is -0.466307 (difference of 0.182335) as is indicated by the link below:
http://wizardofodds.com/games/blackjack/appendix/1/
Your EV's are way off. Look at the hilo EV's per matchup for each TC:
https://www.card-counting.com/cvcxonlineviewer3.htm
15vT never has an EV higher than -0.42 at any TC between -6 and +14 inclusive for hilo whether you hit or stand yet you state an EV for Hilo of -.279088 which is considerably higher EV. Either you aren't saying what you mean or you messed things up pretty bad.
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