Archer build and breakthroughs

[Ace]

I want to mainly focus on using bows and a 2h axe as back up and would like some input. I'd like to be able to defeat at least 3 post MQ bosses too. I'm going to use speedster since I haven't used it much before. I'll be using potions to bring alertness up since there's you can't use Probe with a bow..no bow bashing, unfortunately!

Main decision being Blitz or Anticipation. Not sure if I should use heavy armour and Blitz or Anticipation and light armour. The appeal of moving far quicker by combining light with Blitz might make end game bosses near impossible. I do still want my character to look like a hunter style archer.
The other breakthroughs I'm not so sure about. Is Wild Hunter's extreme bleeding still useful? Even if it is, do I have the quickslots to spare?
Mercenary will help with movement but I'll be missing out on the tier 3 skill completely.
I don't mind using some magic, especially nature themed ones from the Cabal Hermit. Same issue as above, tier 3 skill won't be used.
Rogue Engineer seems useless since I'm using a Boozy backpack and barely sneaking or using pressure plates.
Rune Sage doesn't fit although I do like that it can counter the negatives from Alertness, same goes for warrior monk except I won't have the quickslots to use the tier 3 skill.
Gear and items suggestions are also welcome. Elemental resistance potion being a given.

Semi-related: Is the speed of Probe dictated by the weapon? What is the Probe icon supposed to be?

Edit: Just found this. https://www.youtube.com/watch?v=hAy_MnzCWng
Looks like you can avoid most attacks with speed. Didn't think it was possible. Maybe speed gear and Blitz can work.