It is expected to have something like  30% SP CPU due to the diagnostics tests 
that run on the LCs.

Excessive SP CPU usage is typically related to Layer 2 operations like STP, 
IGMP and LACP.

But another root cause of SP CPU running wild can be HSRP on multiple SVIs. If 
this applies - have You set priority? Do You use preempt?

Applied "no ip proxy-arp" on SVIs? "no ip redirects"?

You may also try to disable the diagnostic monitoring of LCs and verify 
outcome. 

switch(config)#no diagnostic monitor module all
switch(config)#end
switch#remote command switch show proc cpu hi

Cheers
Sven
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