For some reason the terrain gen fails bad some times. If you get huge vanilla biomes and huge oceans, delete the world and generate a new one. I am in contact with the dev of Lots o' Mobs to see if there's a fix.
We highly, highly recommend adding FastCraft to improve the user experience: http://forum.industrial-craft.net/index.php?page=Thread&threadID=10820
Put it together with the other mods, usually %appdata%\.technic\modpacks\slaskcraft-pack-vol-1\mods
You can also add other visual mods if you want, i.e. better grass and leaves.