Originally Posted by
Mister Full-House
Lands, Eldrazi and MUD are all preboard unfavourable match ups and you definitely need some land hate if you want to even the chances. Blood Moon or Back to Basics are the most common choices, but you can try more exotic variants like Ruination or From the Ashes (which is just better). Speaking about your sideboard I'd probably cut BEB and Chill for those cards since there is no pure Burn decks in your meta.
Food Chain is just terrible, I think there is little we can do about it. I find that match hardly winnable because of recurring creatures with combo-out and personally would be thankful for any insight.
UR Delver match up though never seemed that hard to me, what problems exactly do you encounter? if it's more burn stuff then you might think about adding Leylines to the sideboard, though it is a narrow card, which can be useful in fighting specific decks (Storm and Burn mostly).
Speaking about siding techs there was a guide by Whitefaces not long ago in this thread, try to look several pages back to find it.