High Power, Moderate duration for spammy effective fun.

No survival mods because honestly the overshields from grenade fan and just all of temporal anchor makes you as hard to kill as any of our best tanks in game. Obviously this isn't a boss killer, so eidolons and orbs are probably not going to be fun with this build. Everything else is well within her ability to tank.

Moderate range, as her range on both [Blaze] artillery and grenade fan scale well with range. This is a blessing as [Protea] really doesn't want any negative stats, and fitting this all in with no [Blind Rage] or [Overextended] isn't easy

Dispenser takes care of all your energy needs. Supplement with energizing dash or arcane energize. No need for [Fleeting Expertise] or [Streamline] here. If you are planning on tweaking this build with [Blind Rage], I would suggest trying to stuff some efficiency in (unless of course you're always running with a [Trinity] or [Harrow])

The balance between duration and strength is really the name of the game here. This is my strength build, however i'm not convinced she needs 200%, as [Protea] scales rather poorly with power strength (probably as a result of balancing her passive). That being said, the much shorter ramp up time on [Blaze] artillery's damage is absolutely key with higher level mooks and the extra second of turret by going 220% duration is not worth the 2 or 3 extra shots it takes to match the damage of the 220% strength turret. In short, High strength if you're running higher level content (ESO, Sorties, Steel Path) and more duration for farming lower level mooks (hydron, cracking relics, ect...)

As for arcane choices, Energize is pretty much the best choice, and helps smoothen out your energy economy, but is very much not needed with constant dispenser uptime. Your second choice is very much up to you. I would not recommend grace, [Guardian] or barrier, as for the first two, you always have shields up, and armor does not effect shields, and grace does nothing for shields. Barrier doesn't help when most of the time you have overshields. Aegis is a bit better as the shields over time buff is quite strong, and will help you maintain a full shield gate. I have eruption on here, but honestly any damage arcane ([Fury], strike, tempo, ect) will serve you just as well. Luckily protea actually has a kit that encourages some of these more niche arcanes.

TL:DR: Higher str and good range/duration for higher level play. Use energize, and whatever other arcane, but not grace, [Guardian] or barrier

If you've read this whole thing, thank you. Enjoy the build!