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First, you cannot combine limits as @AverageJoesCredit said, and you're not an idiot. The forums gets the best of us sometimes, and we go on app spree's and get cards we really don't want or need just to see if we can get them. Im the queen of app spree's , LOL...
Secondly, Walmart and Amazon will grow quickly, and surpass your PP limit by a lot. I would just keep them, at least for 6 months, 1 yr would be better, and grow the limits via credit solutions ( # in the backdoor threads). Within 60-90 days I can bet you that those limits will be at least that of your PP limit if not more. I would try for a CLI on Black Friday or shortly afterwards...good luck!
You could just make a DR video with those CCs you don't want. Some of them have been very funny. Just don't forget to check the balances each month as unused cards can also be targets of ID theft.