No help? Anybody please........... Thanks!
I sincerely doubt that the answer resides in this community. Boeing has the responsibility for providing operating procedures for operation wityhin the defined operating icing envelop under Part 25 of the FARs. These concerns take into account both the aircraft and the engine needs, including the engine inlet.
The engine gets into the act via not only its ability to generate heated air for use to control ice on the aircraft (including the engine inlet) but also the idle RPM used to control ice accumulation on the front surfaces within the engine (spinner, fan blades, struts etc.)
The thermal and energy balances for all this are assessed by Boeing and promulgated via the Boeing operating procedures. While heat is normally your friend in icing conditions, too much heat may lead to premature fatigue of internal baffles etc.
Since I don't really understand why your question I can only point you in the direction of Boeing for a credible answer.
"the iceman commeth" and now leaveths