Have you tried Potato Creek State Park? We've been there once, my parents used to camp there years ago. We had water and electric and for overnight it was fine. The sites were fairly large, so it was quiet.
We are currently at Summit Lake State Park over near New Castle. We came in on Sunday afternoon. Checkout was 5:30, so it was still quite full. By the time checkout rolled around there were only 2 of us in this loop and the other one was a camphost. There are not a dozen rigs in A and B loop total now since Monday. If you can camp during the week you'd have it made. We full time, so that's not hard for us.
The sites here have been upgraded to 50 amp and water on every site. Bath houses are decent so it's a win/win.
My biggest gripe with Indiana parks is the price. They have really shot up in recent years. As former Hoosiers we now have to pay out of state prices for admission to the park and the camping fees, but we are here to visit our doctors of 30 years, so it works for us for four days. Prices are higher on the weekends.
We also camped this year at Ouabache State Park near Berne. It was refreshing to find this park near Amish country. Out in the country, very wooded, but sites for big rigs. We got a FHU site, not sure the price, but reasonable. Not at all crowded, people friendly. Even had a rally going on of "older" campers and they were quiet, just enjoying their time together visiting.
Tornadoes went through the area and we had a camp ranger rapp on our door to tell us to head to the concrete block bath house. Never had that happen before. Later walking the dog, the ranger was sitting at the start of the camp road because there was another alert and she was ready to warn us all again of another threat. Really appreciated that because it was hard to get any type of cell service or anything out in the boonies.
Dale