I think I played around with PER builds the least out of all my build tries, but I learned something pretty valuable regardless.
To take advantage of it, the trick is movement and stealth just like AGI builds. Getting boxed in is the worst. It was in AGI that I learned that there are a number of tricks you can pull off to make your job easier. I kept a small stack of rocks to throw, a stone axe to clean up glass and paper garbage, and NEVER carry food that will give your position away, and I used to carry barb wire with me all the time to set up a slowing trap, but it appears that wooden bars are almost as good as throwing frames in doorways and choke points for extra safety. Spears require space because if you throw them you might miss and loose the spear, but they provide a nice amount of range that's better than fists or knives. I kept two spears on me, thought I prefer to keep my hotbar clutter free and always one spot open for basic fists in the early game. In PER builds you gotta be trixy and patient. But, if you must kill everything there's still explosives, which are REALLY nice when you absolutely need them. I know AGI has the stealth perks but if you have access to the muffled connectors, you'll never need more than 1 perk in it.
Early game play before I sank in QoL perks, I would set myself with a small raised position like on top of a fence or nearby wall, or maybe a small three block sniper tower made with frames. I would specifically choose easy POI's with places I could run to or create a kill zone in. If I hadn't invested my perk in sneak, I'd make a ♥♥♥♥ ton of noise and round them up and bring them all outside on open ground. Move to get into proper position and pew pew > profit. Chances are, you might have looted a pistol or a double barrel shotty already and that's helps too a little if you don't want to do all the prep work.
Also, consider wearing only light armour with college jacket and high performance running shoes for that shwiffy +20 movement speed bonus. They can't hurt you, if they can't get to you.
I didn't stick to PER for long because a new patch came out and I felt like it wasn't too much of a difference from AGI to make a huge difference in playstyle for me. New patch usually means new map.
It is a challenging and fun build definitely, but it lacks a lot of the smash and grab playstyle that so many people tend to prefer. For that, I set my days to 90 minutes.
