Somehow the trigger rate was not matching the trigger source.
Find out that Link 3 was not collecting and possibly holding the fragment assembly in the main thread.
Swap Link3 <-> Link0 on the V1725, restarted.
Needs further investigation!

Date rate is fine now! CPU load is balanced on all 4 threads (~25%)
- irqbalance disabled
- change affinity for A3818 to cpu9: /etc/rc.local add: echo 0200 > /proc/irq/136/smp_affinity
  Check : watch -n 0.1 'cat /proc/interrupts'

Maximum Trigger rate (HW buffer not rising) 1950 Evt/s => 200MB/s 
for event size of 100KB composed of 4 banks with 32us per channel.