Doax,
Whenever I see a thread about insulating the ICE for better performance,
Randall's Insight comes immediately to mind. The ICE is completely covered
and has imbedded temp sensors.
(Click to enlarge)
A sight to behold!
This shows what is achievable... well, at least by some... or by one.
Read more about
Randall's Insight.
(This has been posted before, but it's so spot-on for what you're thinking
about it deserves a fresh airing.)