Just to be sure... The Radio Shack FM trap (filter) was installed between the antenna and outdoor section of the preamplifier... ?
If yes, you are getting to the point where you need to consider trying an antenna with more gain and narrower forward beam. This would very possibly eliminate the need for amplifier gain which would eliminate the noise and distortion produced by a powered amplifier. You would also be reducing the relative amount of multi-path interference received.
I'm quite happy to agree with the HD7698P recommendation made by @teleview
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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