Pool and Spa
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These pump housing are a pain in the butt I agree. I have found that when you install a new band gasket-o-ring you need to use AQUA LUBE to lubricate the big o-ring and get a seal between the two plates you can use other lube's just do not use a patrollium based lube as this can ruin the o-rings use a Silicone based one.. Also I would re-inspect the two plates for any signs of a crack. As for the clamp... as long as when you put the band clamp together you have some of the threads coming through and it tightens done you should be good, you can add some washers to help tighten it as well.