After the swapping game in this weekend. I have done rearrange l3+ with lowest voltage.
With this awesome Voltage Control Tool. I have set everything to lowest voltage (0xfe) and rearrange the miners with similar frequency boards in reasonable hw(1 or 2 hw in minute)
Herewith is the result :
L3+ : lowest voltage (0xfe)
freq        hashrate   
456m        592m
444m        577m
437m        567m
431m        562m
425m        551m
419m        544m
412m        535m
400m        520m
356m        465m

L3++:   
freq     voltage      hashrate
450m    b0 & c0        585m


Sent 0.2 LTC to his address.
https://live.blockcypher.com/ltc/tx/93dbcb6bda38aaa7cf3bb173c0d2eb60e85170e6733db1ea2b26b968edba8ac2/