Tweaking QoS port parameters and policing

Hi,
Is there a mathematical method of configuring bandwidth weights and queue limits or is it more art than science? For example, using the 3550 series switches, when you perform auto-qos, it chooses the following parameters:
wrr-queue bandwidth 10 20 70 1
wrr-queue queue-limit 50 25 15 10
I need to know the reason for how this values were chosen, in order to understand how changing these values affect the overall queueing process. Is there some kind of best practice (recommended) values for setting them? I notice a pattern that bandwidth weights with the exception of the priority queue (qid 4) are larger; whereas the queue-limit values are lower for higher priority traffic, i.e. they get the smallest slice of the egress buffers.
Also the burst-byte value parameter in policing under policy map. How do you obtain an appropriate value for this? How does that relate to the access-rate?
In the auto-qos it gives the same 8000 byte value to the burst byte, see below:
policy-map AutoQoS-Police-SoftPhone
class AutoQoS-VoIP-RTP-Trust
set dscp ef
police 320000 8000 exceed-action policed-dscp-transmit
class AutoQoS-VoIP-Control-Trust
set dscp cs3
police 32000 8000 exceed-action policed-dscp-transmit
Any help is greatly appreciated.
Many thanks

To allocate bandwidth between standard transmit queue 1 (low priority) and standard transmit queue 2 (high priority), use the wrr-queue bandwidth command is used. Use the no form of this command to return to the default settings.
http://www.cisco.com/en/US/products/hw/switches/ps708/products_command_reference_chapter09186a00801026fa.html#wp1085797

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