i think this is correct. but remember, a slant is not only more aggressive, it's also fundamentally different due to its uneven blade exposure. you will have to re-learn your technique a little bit to use a slant, if i understand it correctly.I'm getting Slant > DE89L > Merkur 12c > Gillette blue tip (what I have). Is this correct?
also, if you are having tugging issues, focus on improving the results of your WTG pass(es) - getting your stubble extremely short is the way to reduce tugging.