The S&B and Fiocchi loads are OK. Any current standard commercial 9 mm load will not be too hot unless it is marked +P in which case it isn't standard. Worry about the OAL rather than how hot it is. I would avoid the Russian commercial stuff as we have had reports of over pressure rounds.
A spring will take a set when first installed, that is why the Wolff 36 lbf spring in your pistol is slightly shorter than the new one, aside from spring to spring variation due to tolerances.
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