Doing a "hard" seafoam treatment, as you did, works very well at cleaning the carbs out, but the more seafoam you put in, the more your engine doesn't like it. It'll probably run poorly for that tank of gas, and when you fill up again, you'll see the true results.
The other thing to remember is that, particularly on carbs that are really dirty, using Seafoam can make things worse. It will loosen all the varnish and garbage that was previously trapped, and that stuff has to go somewhere.
My best results for my vintage bike is a hard treatment of Seafoam, which for me is a full can of seafoam into the tank and then fill it to the top with gas. Run the crap out of it, and then sync and tune the carbs when they're clean.
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