In fairness, you are complaining about 2 stat points you feel are misplaced, one in FIN and one in INT. It's not ideal, and your suggestion of +2 WIT, +1 INT (or +1 CON) would probably be better, but in the grand scheme of things, it's just 2 attribute points. You get that much per level, and it's not that hard to get that much from gear.
Starting out with 10 WIT does not automatically make the Summoner class complete garbage.
I just rolled up a new Human Conjuror, and changed their starting stats to be +2 WIT and +1 INT, giving them 14 WIT at level 1. Summoning stuff "as fast as possible" does not work like you apparently think it does. Even if you start first, neither the Incarnates, nor the totems act until the next turn.
The enemies will always get a chance to act on that turn, and then on the next turn the Incarnates and Totems can act (assuming they are still alive). The Totems and Incarnates WIT/Initiative seems to be 12 + 2/level for the Totems and 10 + 2/level for the Incarnates, and it is not affected by the WIT or Summoning skill of the caster.
Acting before the enemies lets you place your summons, but the summons themselves will not do anything until the following turn, so the enemies will get to act at least once before the totems or incarnates do regardless of how fast the Summoner is.
