Dishwasher not getting hot water
I would not expect just a couple of feet to make a difference even with 3/4” plumbing. It may have been that your sanitized light was just on the edge so you never noticed it and now with a couple extra feet it is below the min temp. 
I would consider re plumbing with a smaller line the flow for the dishwasher is tiny even a 3/8 line would have sufficient volume for a dishwasher and the water entering the dishwasher would get hot faster and not be an issue.
 The other option would be to add a point of use tankless water heater some of these are quite small and will fit behind the dishwasher (I have installed them for the same reason) when replumbing would have been more expensive than the small tankless and the new circuit.
Even though I am an electrician I prefer the plumbing option as it is 1 less thing to go wrong as the tankless units have a shorter life than copper plumbing. ( I know the light load of the dishwasher extends the life on the units as I installed 5 in a small tract of homes, one had an additional bar sink that one has been replaced but to my knowledge the other 4 have not been replaced).