What type of RAM you have on your cards, Samsung or other?
For my MSI Aero 1060 6gb with Samsung, these were the afterburner settings and the averaged results. The power limit apparently differ from maker to maker. Some get good results with 50%. It seems that underpowering decrease the hash rate quite a bit with everything else the same. On the other hand, once the card reached its max, giving more power has no further effect. For me, playing with the core speed had no effet pro or con, however, I'm doing Eth only mining. ~950 mem speed, the cards go over 25. However, you can start to experience issues on the long run.

Power|	Core|	Mem|	Avg Hasrate
50	|-200|	000|	18,8
54	|-200|	000|	19,7
58	|-200|	000|	19,7
62	|-200|	000|	19,8
50	|-200|	300|	18,1
54	|-200|	300|	20,9
58	|-200|	300|	21,3
62	|-200|	300|	21,4
66	|-200|	300|	21,4
50	|-200|	600|	17,6
54	|-200|	600|	20,3
58	|-200|	600|	22,7
62	|-200|	600|	23,1
66	|-200|	600|	23,1
50	|-200|	900|	17,0
54	|-200|	900|	19,9
58	|-200|	900|	22,3
62	|-200|	900|	24,6
66	|-200|	900|	24,8
70	|-200|	900|	24,7
70	|0000|	900|	24,7
70	|+200|	900|	24,7
62	|-200|	910|	24,6
63	|-200|	910|	24,6
64	|-200|	910|	24,7
65	|-200|	910|	24,8
66	|-200|	910|	24,8

.


well i stopped dual mine cause 24.5mh eth is better than dual mine with 1060 3gb doing if i remember well 20mh eth/200mh dcr
the only one miner very fast was nicehash miner 2 nvidia version that was allowing to do with 6x 1060 3gb 131mh eth+3.1gh dcr doing great results with his internal excavator miner.
now with the new 2.0.1.4 version they removed dagger algo and dual mining for all 3gb cards which i am stuck in old version.
calymore max did with 6x 1060 3gb was 129mh + 2.6gh decred

recap  i got my 1060 3gb card doing

overclocking
 
Zec 300 sol stable
eth 24 MH stable

1060 6gb
eth 25 mh stable but l leave it at 24 mH for other reasons .
Zec 312 to 320 sol stable


1070 haven't played with it yet just bought it .. so far

normal stock setting

eth 26 MH

ZEC  432 sol

overclocking that i tried so far

1070
eth  31 mh  
32 MH makes it crash.
zec 490 sol.

My cards not samsung ram so it only 19.x so said 

25.2 MH/s stable on claymore

1060 6gb armor ocv1 (msi)

Power limit: 60%
Core: -100
Memory: +1000
Fan: 65%
Temp: 55-57°C

~118W from the wall for the whole pc

I never tried but from what i read, it should be possible without affecting ETH hashrate

Why did you under clock the core?

Can i use gtx 1050 for mining?

Gtx 1050 are so cheap so if I bought maybe 5 or 10 would I yield a lot from it?

Yes and no.
The 1050 TI's mhs/W ratio is slightly worse than the 1060 so you will have higher electricity bill for the same performance.
The hash/USD ratio of the 1060 3GB and the 1050 TI 4GB is about the same. However, you need more rigs with more fixed hardware costs (MoBos, CPU, RAM module, PSU, HDD/SSD) to get the same performance as a single 1060 rig. Those rigs also consume more power.

~$1000 = 049 mhs 2x1060 rig     0.049 mhs/$
~$1200 = 059 mhs 4x1050TI rig. 0.049 mhs/$
~$1600 = 088 mhs 6x1050TI rig. 0.055 mhs/$
~$1650 = 098 mhs 4x1060 rig.    0.059 mhs/$
~$2250 = 147 mhs 6x1060 rig.    0.065 mhs/$
In general,  the mhs/$ ratio is better with 1060, unless you get really cheap 1050 TIs and you have additional hardware just laying around.
So yes, you will get money out of it (as long as you get 1050 TIs), but you would get more out of the 1060. And even more if you went with 480s but they are pretty hard to come by lately for an acceptable price.