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Was the units you tried "Bi-directional"? Most cable companies will sell you their own signal amp for ~$32.00-100.00 and you'll know that's compatible and it'll work. They even have noise filters available to keep the signal clean. A splitter should be preferably hooked up as close as possible to the amp, if not directly plugged into the amp's output using a Coax F-Type male-to-male connector. An amp/splitter all-in-one unit is a better or neater solution.
A bit weird that you are having signal problems with 4 devices. The incoming signal should be strong enough to be split 4-ways...which is the common limit for most cable systems.
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