Yellowstone should I split it up

We were in Yellowstone in May and stayed at Madison because it was centrally located ( only 4 campgrounds were open at that time ). We generally were on the go during the day and came back to the campground late afternoon. We took our generator to recharge the batteries. We were there 4 days but could have used another 2 days in the park. If you go in peak season you won't see as much due to traffic. If possible, see the Inn at Old Faithful. It's the largest log structure in the world and the lobby is beautiful and the food is good and reasonable.We were lucky enough to see a mother grizzly and 3 cubs. They walked right down the road towards our van then right past the side.Each visitor center is different so check them all out. Mammoth Hot Springs has a lot to see and you are a few miles from Gardiner, Mt if you need groceries.