Hello,
I did some search to find how switches do load balance on bundled ether-channel links. I found below link which is says for example SUP720 on 6509 has 3 bits hash size which results to 8 different bucket and this is the reason that load balancing on powered of two links works equally. And on SUP2T this value is 8 bit resulting to 256 buckets and helps a lot on load balancing over non-power of two links.
https://www.packetmischief.ca/2012/07/24/doing-etherchannel-over-3-5-6-and-7-link-bundles/
Do you know how it is on Nexus 3064 switch?
Thanks