Hi PaulG,
Nice bike, I like the MT09, I also like Delo 15W-40 as a MC oil.
I think the Delo looked after you fine, given that your Iron numbers are almost the same as the universal averages, yet you went more than twice the average distance.
The oil has sheared or diluted down to a 30 grade. BlackStone say to take the oil further, but I think given the final viscosity you have taken it far enough. I would keep to the factory OCI.