Replacing USB C Port

Hi, I am having some difficulties cleaning the holes near the pins of the connector. Adding flux, more solder and cleaning doesn’t seem to help.
Some advices?

hot air at bottom & tweezer+solder wick

I do it with increasing the solder temp, if i usually do it in 300 then i increase it to 400. Please note before i clean it with wick i usually add more solder on it, let it cool for a couple of minutes and proceed with increased solder temp.