Is there data that makes you think DB is acting as a bottleneck?
While I don't want to undermine the helpful suggestions. I did try a lot of DB performance tuning and changing storage engines to tweak. I also setup fairly robust DB monitoring to make sure it wasn't DB performance.
When I was having massive lag spikes, there was virtually no load, locks, waits, anything really on the DB. The DB was on-box and was on SSD. I didn't save the reporting but nothing about it in my case pointed to DB performance issues.
As others said, a more methodical approach is probably in order to make sure the situation doesn't get more complex.
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