This tells me that the edge just needed to be refreshed; therefore yellow side w/water only. I personally use the blue side for more abrasive work like resetting a bevel or working an unrefined edge. Not that this work cannot be done with either side, it is just my preference. From your original post it seems that the edge was refined but not up to par. Using the blue side more than likely dulled the edge, esp. with using slurry on the blue. Slurry the yellow, silly rabbit. The edge should be able to shave coming off of the blue.
Coticules are a bit funny when compared to a Norton. The edges do not behave the same in terms of tests and such. The HHT (from what I understand) isnt so easy off of a coticule because of the lack of 'teeth' on the bevel and edge. Yeah, you will probably need more laps on the yellow. I use around 20-30 or so to ensure i am getting a good edge on a refresh ... depending on the stone. YMMV and all the other message board caveats do apply.
Did I mention light pressure ?
One more thing to try for fun ... try honing with the edge of the blade at a 45 deg. angle (heel leading) instead of straight across the hone. Sort of like what was happening when you were toe leading.
Nice stone, btw. Looks like a keeper to me.