I prefer this build
http://www.torhead.com/skill-calc#201Zfcr0dRrhZcMcRs0z.1
but you were headed in the right direction. From someone who has a lv 50 sorc, during pve and pvp i find myself using overload a TON when I'm fending off melee mobs and the 5 second stun does wonders, especially because for the first two secs you can apply dmg and it doesnt break the cc. Also I find that while conduction is ok, I'd rather have my shield stun when it breaks, further more polarity shift while useful only lasts 10 seconds and has a 2 minute cool down. Thats brutal and makes it barely ever used by me in pve and NEVER in pvp. If i start a match with it im lucky to get off one spell with it before im forced to put a shield up or cc the opponent, especially 1v1. Hence 0 points in those and two in backlash. Also I think anyone will tell you Death Field is incredibly useful and should definitely be taken over the 1 point in paratism.
Good luck with the sorc