Well, it all seems normal to me!!
Semen changes from what you eat, drink, do.... sometimes it can be thicker, more yellow (although if it's REALLY yellow you should probably worry) sometimes it tastes terrible (trust me I know) and sometimes it doesn't taste at all. I wouldn't worry unless there's a reason to think you have an infection.
Oh, and it almost always dries white, which would explain the wet dreams. It gets stickier as it dries too.
And your penis is supposed to swell when you masturbate! Right? If it seems more than normal you may have gotten a stronger erection or it could just be from a different type of friction. I wouldn't worry, as long as it goes away.