I’d also suggest you look at THIS THREAD, see some of the YouTube videos @Dr_Alex_Harrison and maybe try the Saturday app. Make sure you have both good fueling AND good hydration.
My contribution: there is nothing wrong with malto during exercise. Sucrose, malto, and MANY other things are bad for you in significant quantities while not exercising. But during a hard ride, it’s FUEL and will be metabolized pretty quickly so you can use that energy.