A few points...
1. you should have several management IP addresses: cluster_mgmt, node1_mgmt and node2_mgmt.
Q: What are the IP's for node1_mgmt and node2_mgmt?
2. HW Assist requires a communication path between each other's SP's and node_mgmt IP addresses, i.e.
node1 SP <-> node 2 node_mgmt LIF
node 2 SP <-> node 1 node_mgmt LIF
NOTE: This means the service processor's 10.x.x.x subnet and configured default gateway must be able to reach the 134.x.x.x subnet where your node_mgmt LIF's are... ping the 10.x.x.x SP addresses to help confirm this.
3. The storage failover modify commands need to specify the -node to configure each node's partner node_mgmt LIF correctly... This is a cluster shell command (i.e. nas::>)
storage failover modify -node nas-01 -hwassist-partner-ip <node-02's node_mgmt IP>
storage failover modify -node nas-02 -hwassist-partner-ip <node-01's node_mgmt IP>
4. system node run -node nas-01 cluster shell commands place you into the node's "node shell". That's not necessary for this configuration exercise.