Bill Jillians wrote:
[...]

My cache is currently set to 5.9 days.  I've noticed that WUs stop processing and reset to previous times.  Also my computers crash sadly with Boinc.  Thus I have an overhead of about 15-20%.  With that setting

Computers should not crash at all. There is something wrong, whether it is overheating or failing hardware, or bad software somewhere.

I have PCs running that have been active at 100% utilisation for over a year and never a crash.

Good luck,
Martin