My POI is always off a little when I use lube..... and it is certainly bad for her can long term.
Sorry, I couldn't help myself. I'm still an 8th grader in my heart.
Back to the topic: I've run an external suppressor wet before without any noticeable change in POI and it was definitely quieter for a few shots. I'm not sure you would want to do it with an SD though, given the barrel vent holes an all.