I have one of these Manfrotto ball heads and use it for portrait and product shots, as well as the odd macro. I have tried mounting a long lens on a ball head, the head holds the weight without any problem, but it was not easy to control. I'd stick with the 393 for long lens work, it's more than capable of handling the load. You could alwasy buy a quick release adapter for one of your heads so that you don't need to swap plates.
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