Dell Precision 5810 CPU Upgrade

I am trying to determine my options for upgrading the CPU in a T5810. I have seen a couple of posts in this community and elsewhere but not seeing any definitive answers on a recommendation that would improve performance.
My system is using the stock Intel Xeon ES-1620 V3 @ 3.50Ghz processor. I am currently running 32Gb of DDR-4 RAM at 2992.9 GHz in four of the eight slots. My understanding is the CPU sits in a 2011 socket.
I am looking for something to help me with video editing, specifically with Adobe Premiere which when rendering or encoding maxes out the CPU all the time. 
Here are my questions:
1.) If there is just a straight "This is the fastest compatible processer", what would you recommend?

If that is not a straightforward answer then:
2.)Am I limited to just the Intel E516XX processors and if the only faster option would be the 1650 or 1660 could I expect a substantive increase in performance?

3.)Can I use an E5-26XX processor and again would something like the 2690 running 8 cores at 3.3Ghz give me a benefit?

4.)Lastly, am I chasing a dead horse at this point and am better off looking at getting a new Motherboard/Processor setup?

I appreciate anyone taking the time to respond. I am not a tech guy so don't want to get too much into the weeds here. Just need help getting this matching to run better.
Thanks.