Hi @origingame thanks for your questions. To give a quick response:
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the limit of nodes per node provider is currently 42 (see the forum posts node diversification part 1 and node diversification part 2). So no additional node machines above 42 can be onboarded. In practice this will be much lower as with the optimization tooling (described in the post above) it can be seen that adding only a limited number of node machines per node provider will actually support further decentralization of the IC network.
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the reduction coefficient applies to each additional node. See the example on the wiki page on remuneration (Node Provider Remuneration - Internet Computer Wiki): reward for Node 1 2748 XDR, reward for Node 2 is 2693, reward for Node 3 is 2639, and so on.