MSefi.com read only forum (Jan.15,2018)

Is it normal that my coolant temperature drops almost 25 Celcius degrees when I go WOT (I think that's about 45 degree fahrenheit) ? It drops from 78C (172F)down to 53C (127F)...
Shouldn't it go up, if anything at all ?
log file:
http://rapidshare.com/files/320643970/2009-12-13_20.33.22.msl.html ...

For who ever is interested to what I did:
I changed my grounds. Every sensor is grounded with a single wire to MS now and MS is grounded with the remaining wires to the engine.
Works so much better than before now. I found a sensor that I grounded provisionally directly to the engine (which I forgot ...

In the last sentence I meant to say 'insufficient' not sufficient...

Thank you !
So do I get this right ? I could do the following:

DB37#18 could have ONE wire go to the two hall Sensors
DB37#19 ONE wire to IAT, CLT and TPS
DB37#8-11 four wires to the engine block

I should not take one wire for each 'device' like this:
DB37#8 one wire to engine block
DB37#9 one ...

So as far as I understand, there are two different grounds on the DB37 on a MS2-V3. The ones to ground MS to the engine block and the ones to ground sensors.
I think 8-11 are the grounds to ground MS to the engine and 18,19 are for the sensors (IAT and CLT), right ? The problem is, I have to ground ...