coolant issues, maybe?

As you can see what i have done to my motor below on my sig., I was over heating bad on my 347. I bought a radon temp gun and it was at 215 or so. I couldnt drop the temp and it was a new moror, like 5 miles. i had a 160 termpt, and a stock fan plus stock radiatror.. I bought a 180 thermt, new 16lb cap, a flex fan, used CLR and flused out the radiator, put in a bottle of engine ice. Now it runs at near 170 or so, give or take a few degrees. Is this good or bad. With the temp this low Id assum that my therastate hasnt even opened yet. I put on 200 miles, high and city. Im just worried that this is a bad thing. Any clue as to if this is to low of a temp or??????

Thanks

after a 1/2 hour of driving or so, I point the gun at the heads and they are around 168-175, the therats housings is at about 160 or so and the rest is not even near 180 to open it. Do you think that its opening still? This car/motor is driving me nuts