Technically, Snipe went from...
200->300->400 to 150->300->450. For all intents the damage was barely changed, they simply didn't add the other ranks back because nothing goes above Rank 3 right now. The real change was the higher cooldown for a MUCH increased range (25 to 90).
Hammerslam is capped at 950 (same as the old rank 3) as well because it's missing the extra rank (maxed at 1200 before). So I'm going to actually side with "this isn't intended to be balanced" side for the moment, the trees are mid-revision and simply aren't done yet. Some abilities are better off at 3 ranks, some aren't.
Snipe lost two ranks, not just one, so it took a bit more of a relative hit.