St. Pauls' Protestant Episcopal is in Georgetown, not Lewes.St. Peter's Episcopal is in Lewes.
Two volumes have been published of Sussex Co, DE cemetery readings.You can find copies for sale by an internet search.
Once you get exact titles you can ask your local library to borrow them for you through its inter-library loan service.
It will help in your search if you spell 'cemetery' with no letter "a" in it.
C. H. B. Turner published /Some records of Sussex County, Delaware/ (Philadelphia: Allen, Lane & Scott, 1909).There are some pretty random bible records, a few readings of the oldest cemetery in Lewes and extracts from the St. Peter's Vestry minutes there -- as well as selected early Court and deeds extracts.There are many mentions of Rodneys, no Butchers, one Marvell.You can find an index in a free internet site with an internet search, and the book itself is on Ancestry.com and can be borrowed by inter-library loan.
The Delmarva Peninsula lacked a local source of hardstone for grave markers, so only the very wealthy could afford to have durable stone such as granite imported for carving for their gravestones, or create stone crypts.Most people were buried in family farm cemeteries, where graves may or may not have been marked with a stone.Cheaper soft stone such as marble and sandstone readily erode, so the majority of surviving readable markers are rather more modern than from the period you are looking for.Remember that the area is quite susceptible to hurricane-type blasting storms, which do not treat soft stone gently.
The Delaware Genealogical Society has published an excellent research guide for Delaware, which you can find for sale on its web site, and could be a worthwhile investment for your research.