diversity method does it work

Hello guys hope u all ok Hope u can all hlp I have an oven and hob Hob =5.5kw size of cable 6mm Oven =2.3kw Fuse = 30amp All appliances are using the same cooker switch with a socket outlet In the past I have had 2 hobs over heating and burning my worktop. My question is if am to use the...