Read all throught this and some interesting points made, claims, counterclaims etc. The only thing that does seem clear, is that there are many, many who think they know but actually don't.
Just wondered, why - if using de-rate you would ever want full flat rated power anyway.
Apart from the issues with vmcg, all your obstacle clearance for engine failure is covered by your weight tables anyway. So providing you RTOW is derived from the derate/assumed method you have all the power you need even with an engine failure at T/O.
My understanding is the most engine failures at T/O are at full stress, so to increase the EGT on your remaining engine (when the power you have will already suffice) puts an increased risk that you will lose that engine too?