I think whats happening is that in the morning, the tranny fluid is drained to the bottom of the pan. That means the gears are not lubed. You have to warm it up and get the gears lubed by driving really slow for a couple of minutes, so that it won't be so notchy. Synthetic will cetainly help as it clings on to the gears during overnight. Red Line is the choice for tranny oil.
Black 99 RS