Page Writes too high but normal values on PLE and BCHR?
Page write is just an indicator of logical writes as well as physical writes.
Logical write is an operation that happens when the page is being written in the buffer(dirty buffer) and physical write is an operation that happens when the same dirty buffer is converted to clean buffer and is being written on the physical disk.

Definitely, this is not a single metric to judge memory pressure. You need to combine different metrics for coming to a conclusion.

But in your case, it doesn't seem to be a problem as your page life expectancy is quite high which indicates a page will remain in the buffer for around 37k secs. 
So you don't need to worry about memory pressure I think.