After changing the PSU to Cooler Master 450W, i do have higher hashrate now:
#192.168.0.100 [15.46Mh/s] [/home/prospector ]# gstatus
CPU TEMP:- 33
System Uptime:- 2 hours, 44 minutes
GPUS Installed:- 1 Pcs
name, power.draw [W], fan.speed [%], temperature.gpu, clocks.current.video [MHz], clocks.current.memory [MHz]
GeForce GTX 1060 6GB, 98.00 W, 90 %, 58, 1721 MHz, 3802 MHz
#192.168.0.100 [15.45Mh/s] [/home/prospector ]#

Can i improve the hash rate more with Manual Overcloacking as this is with Auto_OC ?