Those welds look great.
Are braces needed with welded tubes? I know the additional braces are good insurance, but are they really needed? I've never seen a tube bend. I've seen them break loose in the housing but never bend. Maybe I need to open my eyes too though.
I'm not sure if you read through the whole thread, but I stated that the tubes were bent. 3/16 of an inch is quite a bit and 1/8 on the other side. The 8.8 axles are heated then the tubes are pressed in and then hit with a dime size rod that gets fused to the pumpkin. This was done for speed and budget. It's not strong and the rosettes (plug welds) are hardly penetrating the steel and as a result are weak.
Welding the tubes to the center section should be enough, but anytime you triangulate you create strength. With the braces the tubes are even less likely to bend or twist under high loads.
This is the best thing you can do other than swapping to a 9" which will be my next step when it's time to upgrade.
Hope that answered your question?