Long wall of text warning
As you experienced first hand, dominating early game is brutal on your resources. The 30% npc skill buff and health buff changed a lot of meta for the game (5mm SMG no longer effective, AR is now switch place w/ SMG on class tier, etc).
How to take down early game enemies in general:
majority of you damage will be from psi - mainly kiting w/ Cryokinesis and Temporal Distortion while hiding safely behind a closed fence.
secondary damage: caltrop, bear traps, grenades
A fishing rod is a reliable, if meager, source of income. You can also invest in 50 effective pickpocketing as well.
Now on to your build:
Premeditate comes way too late. If you get it ASAP it really helps out early game (open door, premeditate psi, close door) - that alone would have helped you get past the Newton quest.
Psi is a package deal. You should get at least 35 Metathermics for Cryostasis
You are getting 13 DEX at level 26 which is very late for energy pistol AP reduction. Once you are at level 26 and eating eel sandwich you will get 10AP per laser pistol shot meaning 9 to 10 shots per turn (50 base AP, 20 from PTC, 20 from adrenaline = 90AP total OR 100 AP total when you have Psycho-temporal acceleration + use native cocaine). Plus you choose to use a sniper sidearm (which is also a slow weapon as well).
I think there are three ways to approach energy pistol:
1. Dump PER, get 18 DEX and Versatility, max melee for 8AP laser pistol shot meaning 11 to 13 per turn @end game. This method enjoy high DEX AP cost reduction benefit right from the beginning
2. Galaxy brain - super high INT so even non-critical shot hurts. You will have to take ability points from somewhere. How you setup your char is up to you.
3. Get 11 PER, 9 CON, recklessness, survival instinct, scrutinous, wear infused rathound leather armor + seeker goggle, use focus stim for 100% crit chance
I mean your build as is will still work - you just won't ever feel OP and your gameplay might not be pleasant.
You also over-invest on couple skills - lockpicking, hacking and mercantile just to name a few.