Yeah, Geomancer should also get a bonus to Earth Damage identical to its bonus to poison damage. Some people might complain that numerically speaking, they would get a larger bonus that the other schools. However, as far as I know, skills only do EITHER Earth damage OR Poison damage, but not both, so you're still only benefiting from one of them.
Not to mention that if there are skills which do both, or crafted skills which do both, it can be programmed in that the bonus is capped at X%, and is split in half. So using Poison Boulder Crush at Geo 1 gives a 2.5% bonus to both the earth and poison, totalling 5%, instead of 5% for each.
Beside that, I'd like to point out that sneaking seem to become obsolete as you lvlup. An assassin can simply use the backstab or teleport to travel. Polymorph even offers Invisibility.
Sneaking is more useful for avoiding fights or pre-positioning your characters in advantageous positions before the fight starts than it is during fights. That does not become obsolete. Sneak also has no cooldown and mobility skills do.
Also the epic weapon so far at lvl 6 requires 11 points into INT/STR/FIN depending on the item. Basically use 1 point of your 10 points that you've earn so far at lvl 6 to be able to use anything. You could even get an item that gives you that 1 point. To me an epic, the most specialized item should required more than using 10% of your points into the specified attribute...
It's a low level Epic. Larian does want to keep Hybrids viable (Hybrids need to invest in additional Memory to make use of their spread-out build). That said, at level 6 you have +12 attribute points, so the requirements could probably go up to 13 or 14 without much of a problem.