Welcome Barkerov! Looks like you and I have about the same amount of time with SH4 . I too was always tempted to try SH4 and wanted to learn manual targeting, but just didn't have the time.
I wholeheartedly agree that it is the outstanding support of the group here on Subsim that have made the game for me. I haven't watched so many Youtubes before in my life. I also haven't felt this way about a submarine sim since "Silent Service" (sheesh I am old!).