Given that we are optimizing maximal DPR:
A 20 charisma is necessary for a maximum DPR for +1 to accuracy and damage. 13 dex, not 15, cause we're using it to qualify for feats. Int is nice, but secondary and doesn't govern damage.
Ignore the hand crossbow. Completely. Grab yourself a dagger if you really must.
Beyond that, looks solid.
Your at-will DPR with a 20 charisma against a level 1 block of tofu:
Hand of Blight:
(1-(12+1-5-1+.65*2)/20-.05)*(4.5+2*3.5+5)+.05*(8+2*6+5)=10.07 If it's just you, the CA isn't worth it, though this is a "high accuracy" attack as described by our prior question. Nominally, you should also factor in the 65% of combat advantage with the rest of your party's DPR, which isn't huge, but may or may not be worth 1.5 DPR. Interesting situational call, especially since it's fort based.
Typical monster HP at level 1 is 32. Therefore you'll take roughly 32/11.85=2.7 rounds to kill a mob. Or... pretty shite. Inverting this according to DPR King 2.0 gets you .37. As 4.0 is the threshold for a "pretty fair striker" On the other hand, there's not a whole lot you can do before magic items and suchlike.
To improve DPR past here we have to make pretty substantial changes to class and or race.
In response to: "I'm evaluating changing my daily and going CON-based. What races would you suggest that might augment that well? I like the pretentious characteristics of Elven types, but am not necessarily a huge fan of commoners despising me due to my race."
There is the option of commoner reeducation via pain, fire, and suffering :) But for a conlock... warforged can be fun... Eladrin works for chalock... For optimal conlock, I'd say revenant (since it means you don't change anything) and can cherrypick your past race for RP or feat cherrypicking purposes. For a vestiglock... I'd normally recommend helf, but since you're not going into paragon... eeh. Mind you, you will be an undead walking around... so... this may not be the bestest choice ever.
In conclusion be tiefling or tiefling revenant. Tieflings have some fantastic feats to cherrypick from, revenant has a better stat lineup and survivability. Grab
Blood Pact of Cania for: " A scaling untyped damage bonus to all CON'LOCK powers really helps out Tiefling Con'locks be more optimal, but for REVENANT TIEFLINGS it is a dream come true!"
Of course, you will be an undead with ancient demon blood in your veins having sold your soul to a sorocerer-king somewhere in your world... but you won't be a drow :).
I recommend disguising your smell with an "alcohol" addiction (much better to stink of booze) and investing in some "genuine flesh-tone" makeup.