Right I'm home now and here's what I would recommend changing.
-Gamblers Armour on Warboss
-Warbanner and G weapon on Bigboss
-30 Orc Boyz
-20 Arrer Boyz
-20 Night Goblins and Champion from Night Goblin unit
-2 Boar Chariots
-3 Goblin Chariots
+Armour of destiny on Warboss (more protection for general)
+Make BSB a Black Orc and give him Talisman of preservation and Enchanted Shield (He still retains 'armed to da teeth' and is hard to kill. Also will mean your savage orcs won't fail animosity.)
+Dispel Scroll on Shaman (stop key spell)
+Goblin Big Boss, spear, light Armour, Shield, Wolf (Can have him on his own to hunt down warmachines/ small flanking units, or put in boar boyz)
+30 Night Goblin unit with Standard, Musician and 2 fanatics. (allows you to spread out your fanatic threats and at least 8 goblins have to die at full strength before panic)
+10 Black Orcs and banner of eternal flame to unit (makes the unit more likely to get to the opponent at a good size and can deal with regen units)
+make boar boyz savage orcs and give shields (hit harder with frenzy and have 6+ ward)
+3 pump wagons, spiky-rolla, Out-rigga and flappas (I love pump wagons, stick them on your flanks and you don't have to worry about flyers or fast cavalry)
+2 Mangler squigs (these guys are vicious, throw them into your opponent's key units or use them to deter charges)
+Doom Diver (knight killer)
Your list didn't seem to have enough units that your opponent had to worry about (e.g orc boyz units), a lack of mobility and flank protection and lastly I felt animosity could really ruin your day.
I feel these changes would fix those problems as now pretty much everything in your army has something to concern your opponent, really good flank protection (pump wagons and potentially mangler squigs) and now thanks to the black orc bsb your savage orc big uns don't have to worry about animosity (except from the big boss himself
I'm sorry if it seems like I have changed your whole army, but its just my suggestions. Take from it what you will.