Not too sure about peppering the case with additional Vibe Transducers. Ninety Nine percent of all vibrations produced by this powerplant are known, and catalogued. Even the one percent is not the problem. The problem is a specific and transient Resonant. There is a reason the problems eventuate at specific Thrust, AoA, and Temperatures.
I brought this up on the BA038 thread, relative to fluids Stall at TOGA chat. I also injected it early on in this thread, (Actually the original). The FOHE is a candidate for failure both in cooling/heating capabilities due its position on the Fan Case. Here, the unidentified (though known) Harmonic wreaks its damage in a trail of Wear to all parts in the Core. The OIL Stub Pipe, the Frames, the Fasteners, the Shafts, the Discs, and the Blades. There was an AD for HP airfoil cracking in 2007 for this engine, and no critical part is immune. A reduction (or increase) in Thrust demand might lessen its effect, but will not eliminate it, save in Operational Profiles only.
By the time a Vibration Transducer causes the EEC to relax its demands, the event is merely the last in an increasingly alarming trail of chronic wear. The answer is not even to identify this transient, (this has been done), but to eliminate its cause. This means that an otherwise perfectly serviceable powerplant has a fatal flaw, a self sabotage that needs a re-design. IMHO.