I use: http://www.torhead.com/skill-calc#200McZhGrRkhrbtzZc.1
Currently I have 30% base crit and 76% surge. After I force crit, I have almost 40% crit due to exploitive strikes.
1 Voltaic Slash = 2x ~1k-1.2k on average (usually always double crits).
After 2 Voltaic Slash, a Shock, a Discharge, and a Maul... I've typically done at least 12k+ if not everything crits. This easily puts most people in Assassinate range.
As far as catching people goes... 2 words, Force Slow. That's it. You can keep anybody perm slowed to 50%. 12 second duration with a 6 second CD. If you're having a ton of trouble just Force Shroud/Cloak out after slowing them. Catch them. Kill them. It's pretty simple really.