First of all we can check SQL server version since there is patch regarding bucket count.
https://support.microsoft.com/en-us/kb/3026082
https://support.microsoft.com/en-us/kb/3026083
https://support.microsoft.com/en-us/kb/3175883
http://www.sqlskills.com/blogs/paul/identifying-queries-with-sos_scheduler_yield-waits/
http://www.sqlskills.com/blogs/paul/advanced-performance-troubleshooting-waits-latches-spinlocks/
http://www.sqlskills.com/blogs/paul/new-whitepapers-on-latches-and-spinlocks-published/
And here is really good blog about this issue.
Spinlocks, When To Worry About Them and Solutions To Common Problems
Simon's SQL 