Hi @Nynaeve_alMeara,
You have done a great job! I immediately saved your website. 
I only noticed there are some inaccurate numbers in (elemental) defense down for these heroes: Sun Shangxiang, Khufu, C. Brienne and Athena.
The correct numbers are:
44% up to 68% for Sun Shangxiang - 6 hits to reach
41% up to 73% for Khufu - 8 hits to reach
41% up to 65% for C. Brienne - 6 hits to reach
41% up to 65% for Athena (same as C. Brienne) - 6 hit to reach
I made two screenshots from battle for you a while ago to show those maximum values.
Screenshot 1: Sun Shangxiang & Khufu
Screenshot 2: C. Brienne
Unfortunately, I don’t have Athena, but I checked the value here:
Keep up the good work! 