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RF 44 channel specific interference? Even when coming from same tower it can happen
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Yes, interference can be, and often is, specific to a single channel. Spurious RF may be relatively stable in frequency and narrow in bandwidth, in which case it will only affect a TV channel if the interfering signal lands in the frequency range of that TV signal. Interference sources can be cell phones, or the towers that serve them, FM transmitters, computers or appliances in your home, energy saving light bulbs, etc. Tracking them down, especially if they are outside your home, can be difficult.
If you are seeing 'signal strength' reported by your HDHR tuner as "100", you may be approaching a signal level that could cause tuner overload. As long as the signal quality has not dropped or become unstable compared to the reported signal quality with no amplification, you don't have to be concerned. But there's certainly no need for anymore amplification when the HDHR signal strength is '90' or higher.