Did you happen to find a solution from TAC on this?
I was forwarded the following link which may or may not be helpful:
http://ciscosupport45.solutionset.com/docs/DOC-18501
The Excerpt from that link is but from your show stack-power may not be pertinent:
Problem Description:
Getting the following error message on a 3750X switch stack.
%PLATFORM_STACKPOWER-4-PRIO_CONFLICT: Switch 3's power stack has conflicting power priorities
Lets see at the output of show stack-power:
Power stack name: Powerstack-1
Stack mode: Power sharing
Switch 1:
Power budget: 1646
Low port priority value: 22
High port priority value: 13
Switch priority value: 3
Port 1 status: Connected
Port 2 status: Connected
Neighbor on port 1: c84c.75b7.4300
Neighbor on port 2: 5475.d096.cc00
Switch 2:
Power budget: 1646
Low port priority value: 22
High port priority value: 13
Switch priority value: 5
Port 1 status: Connected
Port 2 status: Connected
Neighbor on port 1: 5475.d096.cc00
Neighbor on port 2: 5475.d071.ea80
Switch 3:
Power budget: 1646
Low port priority value: 21
High port priority value: 12
Switch priority value: 4
Port 1 status: Connected
Port 2 status: Connected
Neighbor on port 1: c84c.75b7.4300
Neighbor on port 2: 5475.d071.ea80
The output above shows that the switch 1 and 2 are configured with same priorities.
Troubleshooting Steps:
Change the switch 1/2 high & low priority value to some other number and do a "wr mem" in the privilege mode.
For example:
Conf t
Switch(config)#Stack-power switch 2
Power-priority high 11
Power-priority low 23
Switch(config)#Exit
Switch#wr mem
