Suggest you do what FCOM recommends - they built it - they certified it - they know what they are talking about as a result of a whole heap of information not available in FCOM. FCOM is an abbreviated technical document for users(pilots) and is the summation of a large mass of technical investigation derived from flight test data.
Select speed - either recommended Mach or IAS dependent on altitude - as per FCOM
If the turbulence is severe - as per FCOM
Investigation reports are littered with home grown variations which do not have the manufacturers endorsement or recommendation - the lawyers love it !
1.Policy
2.Procedure
3.Technique
4.Advice
Be very wary of the last two when information comes from someone who thinks he/she knows better than the manufacturer !!
ps
ATHR response (lag) can vary slightly depending on the engine fit
Happy flying
