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Trigger misfires

I'm running into a problem where I have X amount of tasks running on the same trigger execution time, but some of them are misfiring.
Let's take for example an Expected Trigger date of 03/23/2012 9:30.
I have 37 different tasks that are scheduled to run at this time.
Of those 37, only 18 executed OK.
expectedtriggeringdate basicstatus count
2012-03-23 09:30:00.000 MISFIRED 19
2012-03-23 09:30:00.000 OK 18
I believe this is directly related to the amount of threads defined in the file for the tomcat webapp.
Currently I have:
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount = 20
org.quartz.threadPool.threadPriority = 5
org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread = true
1) Would increasing the org.quartz.threadPool.threadCount from 20 to 40 fix the misfiring?
2) Would I need to restart tomcat for these changes to take affect?
3) Is there anything else I can configure/change?

These misfirings are happening all the time.
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Re: Trigger misfires

I changed the org.quartz.threadPool.threadCount to 40 and restarted Tomcat.
After an hour of monitoring, jobs no longer are misfiring.
A follow-up question I have is, eventually, 40 threadCount may not be enough. Can I put a value of 100?
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Re: Trigger misfires

Hi Jebiya,
I am facing similar problem in TAC. Most of the jobs are showing Misfired. I am not sure why does it occur and what it means. I did change the thread count to 40 as you have mentioned, but has not resolved the issue yet. Any suggestion from your side?
Thank you.