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Something that has a lot of inertia that is often overlooked is the alternator.
Gates has retrofit kits for 1ZZFE corolla where they replace the hydraulic damped tensioner with a simple sprung one, and replace the alternator pulley with a one way clutch to improve the setup.
The alternator may be ratio'd at many times the speed of the engine, and that rotor is nothing but laminated steel and wound copper. Of course the blower may not be helping, but every time the engine has a hickup, the inertia in that rotor shoves the belt pretty hard It might be a cheaper avenue to look for a decoupled alternator pulley than for a hydraulic tensioner
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