Click. It sounds like you're still too rich. It's like the glow plug is cooling off from too much fuel. Try a couple things (Edward might not agree). Try leaning the top end needle 1/2 turn (down to 4turns) and see what it does. It sounds drastic but it will give you an idea if it's too rich. Or you can try this. When the engine is running, try pinching the fuel line for 2 seconds (this will lean the mixture) then let go and hit the throttle. This will give you and idea about what to do without changing the needle settings. I often do that to see if I need to lean the bottom end more.

Have you looked at the plug to see how much or how little oil is on the plug body?

Also, check to make sure that the plug is not leaking. I had a small piece of dirt in a thread one time and the plug didn't seal right so it didn't run right.

Keep in mind that this engine tunes differently than other engines. Try not to pay too much attention to the number of needle turns. It's more important to tune to your carb. I had trouble with a brand new NovaMega carburetor once. I adjusted the needles to the same number of turns as my NovaRossi carb. But the engine just wouldn't run. I discovered that the low needle setting was too tight so it was actually closing off the spray bar and no fuel was getting into the engine. Once I unscrewed the low end needle, the engine ran fine. Once I got it tuned, the low end needle was unscrewed about a turn more than my NovaRossi carb is. Not to say that's your problem, but it just goes to show that all carbs are not equal.

Don't be afraid to try turning the needle a lot, say 1/2 turn at a time. This might help get to a better starting point. If it doesn't seem to be working, then re-set the needles to the base settings they've mentioned here. You won't hurt the engine. The worst I've done is burn out a plug from being too lean and even then the temps were not over 280F.