really don't get your gripe with the incarnate
it hits a power spike at level 10. it's a payoff for leveling a skill that is otherwise not terribly useful, considering its only practical use is the incarnate (until you get ethereal storm at like level 15 or 16) and arguably rallying cry/soul mate. summoning is a unique skill, so it makes sense that it would function in a unique way
i also think the idea of balancing the 3 source point skills is pretty out the window - they're meant to be OP. the cost is not only locking you out of using any other source skill (unless you use source vampirism) in the fight, but also having to recharge your source afterwards. and let's be fair, enemies get use of these spells too; you can encounter hailstorm as early as the second act, and by the time you hit the end of the game everyone's using crazy high damage nonsense. lots of stronger enemies have high resistances too, which mitigates some of the damage and brings them down a notch
if nothing else, just lower the damage so enemies' armor doesn't disappear as quickly
I think you might have misinterpreted my incarnate change, I am only suggesting that it starts paying off earlier than what it is now. Example: instead of getting a 100% buff between level 9 and 10, it gets 10% buff each level until it gets to lv 10 and becomes champion. Summoning will still be very appealing to level.
About the 3 SP skills balance, I think you might have seen my older list. On the most recent one, the only 3 SP skill I made a change is Thunderstorm, which would shock enemies instead of stunning them outright.
