I don't know about better and I didn't play archer, but I liked the flasks a lot, they're fun to use. Frost is probably less useful on ranged but still good if you get something on you(it's great for melee rogue because it freezes on contact, so you can run up to a mob, freeze it, then shatter it with twin fangs and if the mob isn't resistant to cold that's like 2-3k more damage, or 5k if it's a rage demon), but the other 2 flasks are really cool. I'd say put your items on Sera and Cole and go fight stuff for like 5minutes and see which you prefer.
The class is really good, and thousand cuts conceptually is a nice skill, but the numbers on it are just retarded. It should do like 50%, maybe 75% weapon damage per hit. It does 300% for 38hits, with a ring that's 400% x38, I have no idea how anyone could have made the skill and not thought "well that's dumb". The fact you can one shot anything in the game with it is mind boggling. Then again the entire endgame balance is terrible, the tier3 crafting stuff is way stronger than what's necessary, doesn't matter which class you play, once you start crafting tier3 stuff, stuff becomes easy mode press A for awesome even on nightmare.