What are your Pokemon's EV spreads? Were you missing out on those?
For Tentacruel, Scald is a better option over Hydro Pump because its current set is a support set; Scald has utility in possibly burning opponents and Hydro Pump's low PP can easily be stalled out.
Also, Kyurem gained Earth Power to deal with Heatran more easily as well as Roost for recovery in B2/W2, so you can consider those moves.
If Abomasnow is using a Calm nature, Wood Hammer isn't advised because it runs off of the lowered Attack stat that Calm would have caused. Substitute is the best option in the last slot because it works well in tandem with Leech Seed. Leftovers should be the item to use.