You have it backwards, you want the trailer level or slightly nose down for best towing. It sounds like you're setup is perfect. Really though there are millions of trailers being towed and probably at least 1/4 of them are towed off level with no problems.
2 and 4 inch drop are fairly standard. Though I don't see haw flipping a 2 inch drop will only change your hitch height by 3/4 inch. It seems to me that it will change the height by 4 inches. 2 inches for the tube and 2 inches for the drop.
If you really want to see it you could go to Walmart and buy both the 2 and 4 inch hitches. Connect the trailer to each one and see what it looks liker. Then return the hitch that doesn't work for you.