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As you yourself said there have been many 100 page discussions about your use of EAS to estimate turn performance in the forums you post in and it seems that you still have not mastered the art.
The way you simply use EAS above to derive results for 20,000 ft gives erroneous results that bear no relation to actual performance of the Spitfire at this altitude and a more realistic turn time under these conditions would be about 30 to 31 s.
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We are not going to do another 100 pager because you lack formal education in aerodynamics.
EAS is the most common expression for velocity in all aircraft performance calculation. It is the preferred expression because it is so simple to use.
It is too easy to convert to TAS any performance derived with EAS and you don't have worry about density effects in the mechanics of the calculation. Just convert at the end.
It also a great approximation of Indicated Airspeed and very easy to convert to that with a PEC chart and a universal compressibility.
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The flight speed corresponding to maximum climb angle, θmax, is the optimum flight speed, usually measured in EAS,
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http://www.google.com/url?sa=t&rct=j...o9yenlVuG8g5Zw
If you are trying to quickly gauge relative performance you don't have to convert back to TAS. The specific numbers for rate and radius will change in proportion to density ratio which is a universal application.