Using only the Rad data
The "bothnoshrouds" should give the lowest CPU temperatures.
However, taking to account the Heat Balance, the "bothnoshrouds" is compromised by adding upto 25w extra heat to the coolant.
Something is surely amiss.
Overall I draw no numerical conclusions
Edit:
C/W calculated per
Bill Adams :-
"For thermal resistance, or C/W (having the units °C/W):
C = [(Tinlet coolant + Toutlet coolant) ÷ 2] – Tinlet air all in °C, and
W = m * Cg * (Toutlet – Tinlet) "