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Sweet! Nice work.The span of the flat section for the smaller tanks either limits how much clamping force you can get or you just bend the flat part more than I'd like to see. (The distortion here can affect center to center distance and consequently allow the tanks to come out of parallel.
'Come out of parallel' is the key phrase here. Nice solution! Same problem, here is what I found that worked well for me coming from the welding side of things:
Use massive stiffeners. Only one center hole for the bolt. Crank everything tight. Square-up everything using a rubber mallet. Yes, you can 'tap' on the cylinders to get them parallel. Once perfect, run a TIG bead across the tops of the bands (see pic). Let everything cool, disassemble, run TIG beads across the bottoms of the bands.