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Do you mean that my 30db preamp is probably adding too much noise and the Tablo with it's 4 way dist amp is adding even more?
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Think about what would happen if you went to a rock concert, sat in the first row, and had a hearing aid turned all the way up...
You have to remove the amp COMPLETELY. Leaving it in circuit without power turns it into a 30 dB
attenuator.
Bypass the amp completely, remove it's power inserter and see if the Tablo works. If it does, you have your answer (too much amplification). You have calculated signals that are quite strong and shouldn't be amplified in the first place.
A good rule of thumb is to add up your cumulative insertion losses (coax & splitters) and add -5-8 dB. Pick the preamp that comes closest or just above that number if the use of a pre-amp is actually called for. Do not fall into the "more better" trap.