Benjamin Do you have any rounded stones for sharpening something like a Becker Bk4 or other re-curve blades ? I see you have a ceramic rod . Is that like a 1000 gt like your ceramic stone? I also see that "Bull Thistle", but that's a 120 gt I think, probably too course Something 240- 320 rounded would seem to be good. I think I saw Norton has a round stone.
The ceramic rods we have aren't the same sort of sintered technical ceramic the old economy stones were, and the supply of those has sadly been exhausted, to boot. The grits on all of our stones are in ANSI/CAMI standard, which is different than what the Japanese standards (JIS) is and if you convert the grit size you'll find the stones are finer than you probably thought. ANSI 400 is the equivalent of JIS 700. Honestly, the Bull Thistle would work well in that setting because while it's certainly a coarse grit it's formulated to minimize burr formation. It just gives you a toothy slicing edge, which really works best on vegetation. The Arctic Fox canoe-shaped scythe stone would do well on it.
The manufacturer doesn't have a specified grit on them but they feel similar to stoneware. They're pretty fine.