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Multiple charge controllers on the same battery bank are no problem at all. You are getting up into fairly high voltages in your strings, though, so make sure that the charge controller is rated to handle the full open circuit voltage.
If you are only charging to 36 volts, and you do not have long wire runs, a relatively high voltage coming off your panels is not really ideal. There is a sweet spot for efficiency, but I do not remember off the top of my head what it is as a percentage of battery voltage. Shorter strings might be better, but then you need to add combiner boxes, and you still get left with an odd panel out.
If you are only charging to 36 volts, and you do not have long wire runs, a relatively high voltage coming off your panels is not really ideal. There is a sweet spot for efficiency, but I do not remember off the top of my head what it is as a percentage of battery voltage. Shorter strings might be better, but then you need to add combiner boxes, and you still get left with an odd panel out.