OK. wanna check something first. Those values are for the sec/read, not the read/sec?

If so, You have major IO problems! The memory doesn't look bad, the cache hit ratio is high and the lazy writes are low.

A value of 29 seconds on average to do a read from disk is horrifying. The recomendation is 10-50 ms.

An average write duration of 9.4 seconds is also far, far above what it should be. Recomended here is also 10-50 ms

What's your drive config? How many physical drives do you have in the server? Where is tempDB, the database's data file, the database's log file?

Do you have a RAID array or single drives? If RAID, what level?

Is SQL the only thing on this server?

The full scans/sec look a little higher than one would like. It indicates that some of your queries are doing table scans to find their data. You may need to evaluate indexes.