I just got back from playing the Italian Mana Drain tournament at Area 51 in Cortland NY.  I went 5-2-1 with a intentional draw and a second place finish.  I ran Diceman's list -2 Furnace, +2 Explosives and tweaked the sideboard some.  The deck performed very well verses Chalice Oath, WTF, Transmute Stax / 5/3 Hybrid and WW with Maze of Ith.  However FCG just seemed to be to fast.  It was my only lose in the Swiss and in the finals.  The combination of a faster fundamental turn as disruption from Wasteland / Strip Mine / REB / Blood Moon was very problematic.  I initially was running 2 Pyroclasms however 4 Pyroclasms should greatly help verses them as it inhibits them long enough to establish control.  4 Pyroclasms should also help out verses the U/W and U/R Fish decks.  Their also somewhat solid verses WTF as they hit everything but Mongrel, as Rootwallah is often 1/1 on your turn.  It also deals with Kira which shuts off Old Man.  I also used Rushing River over Rebuild and was very pleased with its versatility.  It's solid verses stuff like Oath in addition to random stuff like Chalice for 0 verses decks that lack a second Rack and Ruin target and of course Darksteel.  Fire / Ice also served to shut off a Maze of Ith and provides additional relief verses FCG and Welders.  You could always run -1 Rushing River, -1 Boseiju / Mind Twist +2 Furnace sideboard if necessary to deal with Dragon and Welder if there prominent in your meta.  I didn't find Mind Twist to be overly relevant all day and didn't bother sideboarding it in once as it seems to slow for the current speed of control decks.  Neither Dragon or Welders are prevalent in my meta and my new sideboard reflects this.  After the tournament I have switched over to the following sideboard and was wondering your opinions.

1 Boseiju, Who Shelters All
1 Red Elemental Blast
1 Pyroblast
4 Pyroclasm
1 Fire / Ice
2 Old Man of the Sea
2 Rack and Ruin
1 Rushing River
1 Skeletal Scrying
1 Mind Twist