I do agree with the advise to terminate unused splitter ports.
I own a CM-3418... and a CM-3410. (I have more than one antenna.) The same amplifier is used in both, the 3418 also has an 8-way splitter built in. I see no need for you to by an 8-way splitter, the one you have works.
The CPA-19 is more expensive, but theoretically better because it has a lower noise figure and easy to place close to the antenna, thus accessing the signal before loss in the down-lead. The CM3410 could be placed in the attic if there is power available, but the CPA-19 is designed to be powered remotely.
Bottom line, pick one of the options, there is going to be very little measurable difference in the final results.
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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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