My preference is to use the simple, clean design. Each amplifier adds a small amount of noise and distortion, though in you case, not enough to cause visible signal degradation. The preamp is in the best location to do what amplification is supposed to do, overcome the losses in coax and splitters. I would ditch the CM-3418... It's not contributing to reliable reception, and may be a source of needless trouble if a new TV of FM station comes on line.
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