Hello Shuming,
thank you very much for your detail check of the tools.
I am not an expert for HSS tools, but I think the cutting edge looks much better than before.
Am I right that you made a 400x zoom?
I think with 400x zoom it would be a miracle if you get a continues white line at the cutting edge.
The raw material and the grinding looks good, so what should the supplier change?
What about the machine, the raw material, the milling strategy, the feedrate, the coolant supply?