That Receive SNR (Margin) of 23dB does suggest DLM has capped your speed because of the errors caused by the power problems. Not being awkward, have you got the full Kbps figures for the speeds please? Those look like you have rounded them to Mbps.
The reason I ask is because the numbers on capped lines are usually recognisable. Then it becomes a question of putting up with it and waiting possibly several weeks, until DLM relents in several steps. The steps come quite rapidly once it does do this. Or trying to persuade your ISP to get the DLM reset. Some are willing, some don't even seem to understand the question
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