Yes, it is difficult to get the proper tension on the KTM. I pull my shock and run it through the full range of motion to ensure the proper tension.
Part of the issue is that I have an awesome z sprocket on the rear which is indestructable. It is probably hard on the chain. The other part is that I'm not 100% trusting this lube. I use the honda red can, which is well regarded, but this chain was trash when I was finished with it. It was like a noodle and had very worn rivet internals.