Polishing the combustionchambers has nothing to do with engine temps and by looking at your pictures I dont think you fully understand what and why doing this helps and whats its done for or maybe I am just not seeing it in the pictures fully
Polishing the CC so you can see your self in it really does nothing but make the guy doing it feel better , what your after is removing any surface or SHARP EDGES that might when EGT come up promote deto/spk knock and altho what you have done is very pritty you have made a lot of very sharp edges
What you want is more of a smoothing effect vs a high pollish
As stated doing what you did has nothing to do with your engine temps they (even with a high polish) should respond just like a stock head , do you have an aftermarket raid? what are your fans coming on at ? have you checked your temps with something other then gauge ? Did you move your sensor or is it still stock position
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