You are certainly approaching, if not already in the area of diminishing returns.
If the goal is optimize to the 'nth' degree, then equip each antenna with a dedicated preamp. Combine downstream of the preamps thus avoiding the NM hit due to the insertion loss of the combiner.
Only if I had a marginal signal that I wanted to make more stable would I consider spending time and money on such a plan.
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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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