Haha...! I have actually done the three routes you mention (although memory is hazy on whether I did Eroica) and would agree that they are likely solid at the grade - esp Barricade at 24
However I can think of some other Natal routes that would most likely need to be downgraded if they were in Boven. Routes like Headology, Voodoo Guru, Sip and Fly and Invertigo. This theme is fairly widespread but not universal. The older routes like Touchstone are very very solid at the grade
That said, I do not care all too much about grades and certainly did not mean to light a spark in the fertile desert brush that is the topic of grading in South Africa. Just thought I'd cast my vote...
Fully agree that my memory can be foggy at the best of times.
BTW Roger: I ran into Don Welch the other day (he is good friends with my roommate) and he was asking after you... He now lives in San Diego with his wife and is still climbing and surfing... (older folk may remember his Allstar appearance in Masters of Stone 1)