Your decklist is among the best I've seen for Kresh.
Once you have a sac outlet and Kresh online, Saproling Burst is pretty nice tech popping Kresh up +21/+21. Even without Kresh online, the burst gives you 6 creatures for your sac outlet-
Other suggestions:
Gate to Phyrexia
Dragon Broodmother
Volrath's Stronghold
Barter in Blood
Malfaegor
Greater Good
Once you have a sac outlet and Kresh online, Saproling Burst is pretty nice tech popping Kresh up +21/+21. Even without Kresh online, the burst gives you 6 creatures for your sac outlet-
Other suggestions:
Gate to Phyrexia
Dragon Broodmother
Volrath's Stronghold
Barter in Blood
Malfaegor
Greater Good