Your deck is a little heavy on the two tribute monsters. May I suggest an Unshaven Angler or two. Other than Levia, you have no monsters that take advantage of Umi (Mermaid Knight, Amphibious Bugroth Mk-3) And seriously dude, Salvage.
If your argument is "but I don't have a lot of 1500 ATK or less monsters" then I have to question the usefulness of Mother Grizzley as well. If all they're there for is Poison Draw Frog or Guardian Kay'est then rethink your strategies.