I’m afraid the hearts are part of the theme’s design, so the only way to remove them is with CSS. It looks like you already have the Custom Design upgrade, so you’re in luck! The following CSS ought to do the trick (paste this into the CSS editor at Appearance > Custom Design > CSS):
I just purchase this theme but i don’t love the hearts either, I found this thread and decided to try the CSS you posted above, but when I click Save, my CSS says it’s “saving changes” but does not move past that. Have you encountered this issue?