casual rdw help

http://deckbox.org/sets/549239

Looking for some help with my casual red deck wins deck.the deck is fairly standard, focusing on small hasty creatures and burn spells to end a game fast. Great against aggro and ramp decks, but kind of poops itself against control, especially esper. Seems to run out of steam due to removal after turn 6 or so, and then Elspeth...

So my question is, how can I sideboard to keep the deck more threat dense and beat control?