you are pushing the red line AND climbing in a wave, spool-up time should also not be an immediate factor unless you got into a "coffin corner" situation in the first place, whether by bad planning or extreme bad luck.
Coffin corner?in a commercial aircraft?
I'm 99% sure there was a Boeing bulletin issued which recommended selection of MCT in turbulent cruise conditions. I'm flying later today ill check it out and confirm. (737NG by the way)
Please continue to do so.
It shouldnt be a routine...but if you have to do it then do it,no prob with that..
A proper fmc input (oat at t/c especially)will provide you with a correct max cruise.
I normally like to be 1000 ft below max when possible/forecast turbulence,when flying into a warmer mass...
If you dont push it too much use of mct should be rare..used it twice in a year in cruise obviously.