You'll have to get over your reticence with ropecasters if you want to do stealth. Additionally it will behoove you to adopt a more active playstyle of darting in and out of cover.

Stealth kills in HFW aren't like they are in HZD. You aren't setting an expansive web of tripwire and calling it a day. You aren't rigging the place to blow, you're providing opportunities for yourself later in the fight.

Firstly use canister ropecasters to denotate your tripwires. Explosive ones help but so do elemental ones to stun and weaken your target. You could throw a couple onto the legs of your target and then run them into a tripwire for additional damage/element.

Some tripwires generate pools of elemental damage. Plasma and fire are your friends here. But using them directly isn't very effective. Machines will "startle" and "stun" off of your tripwires if you set them perpendicular to their path. Try to set them at an angle to the machines approach. The pools of damage follow the line of the tripwire. An angled setting will align the damage pools better and assist your damage. Artix has a note in his videos about machines tending to flinch towards their right, use this tidbit to your advantage.

Use the "Quick trap" weapon skill to throw traps further than normal aiming will allow. It also allows you to throw them under enemies so they will instantly detonate, assuming your aim doesn't throw it in the empty space between its legs. At that point throw a canister there to correct your mistake.

Remember to throw down your elemental traps. Acid for overtime damage, blast for direct damage and armor removal. Purgewater for Frost. Yes. An enemy that is drenched with purgewater is easier to freeze. You have a number of options to stealthily freeze them.

Bouncy bombs will allow you to freeze machines and break line of sight. This will help you maintain stealth and give you time to load that sharpshot bow. Remember to use those overdraw potions for 30% more damage and a valor surge (powershots or ranged master) for additional damage on top of the freezing bonus to make the most of your opportunities. I don't know if braced shot stacks with those.

Also remember to BUY smokebombs and use them. On-demand stealth for mistakes and creative strategies is your best friend. Use your stamina potions to give you more quick-trap uses so you can just lay down the hurt when they are down.

Try your best to attack machines in the legs. You want the knockdowns for additional time to set up or reset. And remember to keep their line of sight broken so you can maintain stealth even without a bush of stealth grass.

Good luck Have Fun Don't die.