The 5x bonus applies to whichever kamihime were just released, and only to Jewel and Premium Gatcha. Your understanding of the timing is incorrect. For example, Svarog currently has an increased draw rate in Jewel and Premium Gatchas. In general, new kamihime are introduced on an opposite-element schedule. Water kamihime are introduced during Fire events, and that's when water players should be spending their jewels (if they want those particular kamihime).