tl;dr Galileo went beyond the data he had to justify the Copernican model - his argument about tides was incorrect (he neglected the role of the moon) and his argument via the motion of sunspots was explicable within the Tychonic model.

Thanks for the summary. In itself that doesn't sound much like misconduct, as it's quite possible to go beyond the data and make incorrect/superfluous arguments without being negligent or deceptive.

(I could read the series you link, plus its references, to try to discern whether negligence or deception actually was involved, but after flicking through the first three parts — 14,000 words or so — and not spotting big smoking guns, I put the remaining posts on my mental when-I-get-round-to-it-on-a-rainy-day list.)