I can't install a CHT probe in the present aircraft because it's "club "aircraft. If it was my own aircraft; I was primarily cruising single engine; and after reading the above I'd have the works (gami, individual cyclinder monitoring JP fuel flow0 and make savings elsewhere. As much for safety as for fuel economy.
I think I remember Deakin saying the rate of temp drop when you switch the engine off is greater than that quoted to trigger shock cooling; although probably starting at a lower base than descending immediatly after a steep climb. The glider/ pilot engineers article is quite persuasive / worrying. Life would be alot easier if shock cooling was a myth.
I do love thread creep.
TIM