Interesting. Thanks for sharing!So I don't normally post anything as I don't want anyone telling what a crumby idea that is or it wont work.
This works for me. The right side of my 590 always runs hotter. I decided to put 2 fire bricks opposite of the auger. Also used 2 more fire bricks on each side of the grates as the base for the 2nd shelf. I chiseled a large V in the bricks by the temp probe so it had some room to breath. Been running it with all the fire bricks for the last 2 months with no issues and the right side is no longer hotter than the left.
2nd shelf - RecTeq 590 grates - I cut off one of the ends on both and bolted them together with fender washers. Although I had not used the 2nd shelf at the time of the photos I have used it since and it works well. It easily slides back and forth on the bricks as needed, 4.5" of clearance from the lower to the upper shelf and 3.8" from the 2nd to the lid opening.
This is all very easy to take out when its time to clean out the fire pot.