Shrinking a monster and using CCV on it is retarded. that's a -3.
Seriously.
Don't do it.
Anyway, volcanics need more than 1 avarice IMO.
-1 D.D. Crow (should be side-decked, not main-decked).
+1 Pot of Avarice
-2 Doomcaliber Knight
+2 D.D. Assailant (IMO a superior card in gadgets. You can run into stuff and if you get shrinked, who cares, you'll still run over it. Nice 1700 attack.)
-1 CCV (you don't have enough targets IMO)
-2 Book of Moon
+1 Fissure (4 is a great number of 1for1 destruction cards)
+2 Widespread Ruin (good card.. I prefer it to sakuretsu since it doesn't target)
Also, no, 40 is not better for gadgets. 42 is better for gadgets. Anyone who plays Gadgets competitively should know that >_>. You absolutely must not draw 2 gadgets first turn. that's why 42 is perfect, 43 is.. okay... but then you lack efficiency.. 41 isn't too good, 40 is bad. 44 is crap.