After a bios reset USB-C charging problem is fixed. I did change some settings in bios which I think caused this problem. Now it is gone. But 11W issue is unchanged. Even in default bios 11W (11.4W to be exact) is the max power. USB-C adapter pulls ~13W from socket to provide this regardless of machine load. Included adapter is also pulling same ~13W so default adapter is also providing ~11W.
I think 11W battery charging is normal, what is not normal is that AC adapter does not provide additional power to the machine while charging the battery. I hope this can be fixed with a bios update. Does any one have any news on that?