Crit Power means better additional damage when a critical hit happens. If you use for example an anatomically aware scope on your rifle, then you get 50% boost to your crit damage - now it being 150%. And with a basic Crit Power feat, that becomes a total of 225%, which is awesome for single shots with high chance and of course guaranteed crits with Aimed Shots alike (which you should use sometimes every round with Shooting Spree). It worths to specialize on Crit Power a lot more than Snipe - which is good on it's own with high enough Stealth.
As for your build, I think you're overinvested in Hacking and Lockpicking. For example an effective 100 with Jackknife should be enough for the latter to reach 130 with Engineer's Suit, Haxxor and Eel Sandwitch. Temporal is enough for 55 (56 for an effective 50 for a better Entropic Recurrence) if you're not planning to use Stasis, however I heard it has it's uses. Do pick up and specialize in Psycho-Temporal Acceleration for that sweet MP, AP buff, so you can shoot your Rapid Spearhead 3 times for an additional round too.
Also, exactly to have better even better Initiation aside from the Paranoia boost + to make the most out of the Sharpshooter feat, I went for pistols as a sidearm. Better crits, and more chance too upon picking up Steadfast Aim as well, especially since a sniper rifle need 5 STR, so I really had no excuse. Biggest bonus is granted while using a 44 Hammerer, whih means that we get to use explosive rounds too (a true wonder that happens to be pistol exclusive only) although Falchions are great too for additional crit chance. And unlike the bursts from SMG's, pistols actually make good use of smart modules.
I went for a hitman kind-of character (just some firearm assassin, no relation to agent47) that has Mercantile instead of pickpocket after I pictured him gearing up from a secret stash of weapon storage before a mission (enable Jackknife and Trapper's Belt pls).
http://underrail.info.tm/build/?HgUICAMNAwbCoDgAAADCncKdTToAPmVlNz5lAAAAOAAATRcBMToeRn41K8KHM0tbKAIwwqTCteKnjAPip74I4rGWBN-_Alternate take with lower agility but higher intelligence and perception, now with 100 on pickpocket too, enough to serve you well (steal oddities even the one from the Faceless boss and the symbol from Mordre for the appropriate quest). And while still able to craft the best Incendiary grenades and Hypercerebrix, explosives of mkIV and Bullheads are now also restricted to a bench in addition to top tier plasma and emp:
http://underrail.info.tm/build/?HgUIBQMOAwjCoDgAAADCoMKgRDtLO1paKjBaAAAANwAARBcBMToeRn41K8KHM0tbKAIwwqTCteKnjAPip74I4rGWBN-_(with 8 INT, it becomes debatable not to switch out something for Power Management too)