Help with a soundfont issue?

I would appreciate any help towards a work-around for the following soundfont problem. It is particularly noticeable in measures 252-259 of the attached. I've noticed it in other scores, and worked around it, but am not having much luck here.
The problem:
There is a reverberation/throbbing sound that occurs during rapidly repeated notes. It becomes more noticeable when the repeated notes drop off in volume. If you Show Invisible in the attached, at measures 253-259 most of the decrescendos are disabled (by setting the mp at the end to the same velocity as the sF or F at the beginning) which somewhat minimizes the reverb (but doesn't eliminate it). If you lower the velocity on the mp's (to enable the decrescendos) the reverb becomes worse, however this is against the composer's intent.
I have used the following work-arounds in other scores, but they're just not doing the job in this instance:
>Make the notes staccato. (Invisible, to be true to the original score.)
>Un-select "Play" in the Inspector for the rapid notes, and add an invisible sustained note. (Used in the bass strings in the attached at 252-259.)(You really can't tell that the basses aren't playing the fast notes, as long as enough other instruments are.)
>If staccato helps but isn't enough, shorten the note even more by using the Pianoroll Editor.
>As mentioned above, keep the notes at the same velocity, don't allow decrescendos.
>Combination of the above.
>Using different soundfonts has not helped.
>Making adjustments in the Synthesizer (Master Effects) has not helped.

>Windows 10 PC running musescore 2.02. I use Timbres of Heaven primarily, but trying FluidR3 mono didn't help, so I suspect it's a limitation of the technology.

Thanks in advance for the help, and for the incredible support that this community provides.