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What would be a good base number to enter for the dead band and following error?

Thank you Tommy,
You were right that that was the PATA setting in the bios.  I changed it to AHCI, and now that interrupt is no longer on the list anymore. 
 
Unfortunately, it doesn't appear that was the cause of my jitter.

Now the only things causing interrupts are
18 - Radeon HD 4250 internal graphics
LOC - (Local timer interrupts)
RES (Rescheduling Interrupts)

Is there anyway to see what causes the RES and LOC timer interrupts to see if the jitter is caused by one of those?

Sometimes 19 also happens, but it doesn't seem to sync up with times that the jitter has variance.

For some reason the nosmt=force setting in the kernal boot parameters doesn't seem to work anymore with the rtai kernel.  Should nosmt still work in the rtai kernel?

I have the following settings in:
ro quiet skew_tick=1 nosmt=force mitigations=auto,nosmt irqaffinity=0-1 kthread_cpus=0-1 rcu_nocb_poll rcu_nocbs=2-7 nohz=on nohz_full=2-7 isolcpus=2-7 intel_pstate=disable idle=poll cpufreq.off=1 intel_idle.max_cstate=0 amd_idle.max_cstate=0 processor.max_cstate=0 nowatchdog nosoftlockup acpi_irq_nobalance noirqbalance

I'm also using the irq affinity script from:  forum.linuxcnc.org/38-general-linuxcnc-q...ead-and-irq-affinity

Should I try a pci graphics card instead of the Radeon HD4250 integrated graphics?  Any recommendations?