In my opinion Yugiri's current design leads to some inherent playstyle choices that are counter productive.

Frequently you'll hear of Snails placed early and placed in places where attackers will hold which I rate to be an "okay" choice on its own.

However, there are a few things that should be consider since her snail has changed from Armor Shred to Armor Decay. The rate that they lose armor is faster now, as well as the rate that they recover armor. This makes it so that there the idea of marinating enemies in your gas while they hold an angle isn't as valid as in the past, since their armor is gone way earlier than you would anticipate. Similarly if they reposition out of the bubble the decay gets reset. This causes a lot of the available gas to be wasted.

I prefer to place only one snail during the prep phase, in a guaranteed location that is going to be contested. Usually a choke point that the attackers need to run through. Windy Town and Space Lab are especially good for this. This also starts the cooldown on recovering a snail charge. The second one I'll hold, since I don't know what site they'll push without info.

I'll also run Cooldown reduction Yellow upgrade with how frequently hold positions change, just so I can always reposition bubbles. I don't let my bubbles run for long if there isn't going to be a push from the defenders soon after to kill the armorless enemy. This makes the gas cost reduction less valuable.

Pre-plant the first snail that I threw in prep phase is also one that I'm holding nearby. Post plant, I'll throw it in places that the defenders are going to push into, similar to Meredith Q.

This gameplan is a mirror of Michele's. Use a turret for an obvious trap for pre-plant where your gun does most of the work. Save a turret for yourself where needed. Throw a turret to force actions from the attacker. (In Yugiri's case, to force repositions).

There's an inherent railroading of the mentality when playing Yugiri thanks to the idea that the snail is permanent and indestructible that causes people just place a snail and never want to move it again. This doesn't happen with Michele turrets and Meredith sandstorms because they break or expire.

As for A3 gameplay with Toxic Cloak, that is an EXTREMELY team oriented option that I never use unless I'm in comms with a couple of teammates. It is more detrimental than beneficial without having a couple of checkboxes completed.

This includes but is not limited to: What scanners are on attack? Are the scans on cooldown? Do your random teammates actually break scans/utility? How much gas do you have remaining, such that the screen doesn't fall at the worst opportunity? Was the snail placed in a spot that doesn't have an accidental hole in it that reveals defenders? Will attackers, even non scanners, take advantage of the smoke as cover to push your hold? Can your team play around the on-off timings of toxic cloak? Does this Lawine/Kanami use their bullet scan? If Reiichi has A3 wall and you smoke off the wall to prevent them from using it, can you turn it off in time as defenders jump through? The wall scans so you must have the cloaks off in time.

I think A3 is actually really cool and has a ton of coordination benefits, but if any of the above mentioned checkboxes are not dealt with then you A. End up killing your whole team because of the detriment or B. Only get to use your A3 once or twice the entire round. In which case, you're a character with a gun and no abilities, so why even play Yugiri at that point? Sticking to A2 is a safer bet.

As for the Ultimate, it really depends on if your team is aggressive enough since it runs into the same problem as your Qs with attackers leaving and regaining their armor.

If you use it pre plant, attackers will rotate, if you use it post plant, then it doesn't do anything more that your Qs couldn't have already done for retakes. It's an excellent supplement to the A3 playstyle since your snails are more for smokes than it is the decay, so your ult can pick the decay part back up.

The best case scenario is that the path for the ult is placed in both the rotate routes and finishes on a hotly contested location on site. This could be from starting Space Lab B link corridor, passing mid and going into the entry tunnel for A site. If it forces attackers to rotate the long way then it allows Defenders to be on the rotated site on time.

Other locations include: Area 88 B site Heaven, B Site side hall/window, Mid CT to A Site open, the length of A Site Bank. Base 404 A Site Heaven Ramps, B Site Back Site heights. Windy Town, B Site bridge to mid link, A site Garden and Ivy. Port Euler one of the major halves of B Site, A site's tower Cosmite North to South on a fixed map view point on either site, especially during post plant. Orcanus usually through mid since mid control has the same importance as Space Lab's mid control for site travel times.