<<<So, I'm a sniping forest gnome ranger, level 25. How important is it to 2x in ambush? I am currently 2x in both ambush and perception and would like to possibly let my ambush go and start doubling in PT. Thoughts? Direct experience?>>>

You can drop Ambush down to 1x if you like. You shouldn't lose much AS (about 3 points I think), at 25th level. You might notice a slight drop in accuracy when aiming from hiding (sniping), but that should get better somewhere between levels 30 - 40ish. Your open aiming won't be affected at all. I trained 1x ambush, 2x perception all the way to 45ish and had no problems at all. You might want to start picking up more ambush down the road, but in my opinion, for now you can save the points and safely 1x.

~ Heathyr and friends