His quality of contact metrics should affect his xwOBA just as much as his wOBA though right? So I don't think that necessarily explains the discrepancies.
There could be some reason but I really don't know what it could be so I think it's safer to assume that it's just bad luck as much as anything else.
Remember, Vlad looked like a 1 WAR pumpkin for about 900 ABs and the reasoning that the board bought into (except for me, Spanky and Tom Tango that is) was that he wasn't aiming his deep fly balls enough. Tango said that kind of stuff is usually just noise on the whole and sure enough, he was right.
Now I still worry about Springer, he's old so he could decline pretty drastically any time now and could actually turn into a true talent .300 wOBA guy. But even those concerns are a little overblown, he still projects well.