I rekon youies is on the rockier side of things compared to harcourt or buxton. Another option is lake mountain - just the second lower half. THe top is a bit more rocky.Black is fine, I do ride the blacks and sanctioned double blacks in WA, blacks at Derby were also generally fine. As someone noted it all depends on who is doing the grading I think there was a green at Maydena that was as steep as a good deal of blacks here. Just prefer something where the flow isn't dependent on massive bunny hops through big rock gardens.