Probably best to lower the wattage setting to 180-ish Max Watts (at least for that loop). 120-125 is the overheating area.
As per philipma1957 page:
Temp Front / Back T,B
33 °C / 72,67 °C
Fan Speed
40
Start Voltage
0.62 / 0.62 / 0.62 / 0.62
Max Voltage
0.67----------------------------- try 0.63
Max Watts
180 / 180 / 180 / 180
I can't see the photos as this site f'd them up.
sp20's should run under 1400gh more like 1300gh forget the ratings of 1650 to 1700gh.
if
40 fan
0.62
0.62
0.62
0.62
0.63 max
are good bump a little
like
0.625
0.625
0.625
0.625
and 0.635
fan 50