I have to admit I came up against a similar HE/Alchemist team in SS but after clearing SS the SSS battles all but the first were relatively easy battles with totally way out there combo's that were all doable with my un skill sharded levelled up 3* characters, just required putting in some of the super talisman sets! Don't lose hope just yet I managed to clear the first full round at SSS level... not sure if I'll be bothered going a second round though...