RY4 = a sweet tobacco with caramel and vanilla
555= a popular British/European cigarette with a nutty tobacco.
When I started vaping, everything, even the tobacco seemed sweet to me. And, like you, was looking for a cigarette like dry, non-sweet flavor. That changed over time, but I understand the search.
Check out the Naturally Extracted Tobacco thread for great recommendations.
Natural Tobaccos - Part Deux | Page 593 | E-Cigarette Forum
NETs helped keep me off cigarettes and were what I needed at the time, and also provided the transition into sweeter flavors later on once my taste buds recovered

Great vendors include Goodejuice, NAturally Extracted Tobacco.com, MyVapeJuice, Heather's Heavenly Vapes, Mountain Oak Vapor, Ether vapes, etc.