on SOJ: Yes - if you have high dps and (1) don't drop a breakpoint (2) don't need the mit/ehp from the ring, it's likely that SoJ will perform better if you are farming elites (vota).
on FN-DF: I think FN:DF is THE skill to use for farming
solo - no question, I would not use anything else (we are talking about the same areas, right? act3 alkaizer maps, act2 vota, act1 cota). I ran without it for awhile and the diff is huge - if you simulate your dps with and without df, I think you will benefit a lot dps-wise as well as a higher freeze proc coefficient (more freeze) as a beneficial side-effect. If you PLAY with it and check how often you actually hit five enemies, it's pretty close to all the time, including elite packs in vota.
For GROUP vota farming (esp in groups with monks and barbs, assuming everybody is relatively close-geared, i.e. not a carry): FN-BoneChill is THE skill to use b/c buffs to party >>> buffs to self, even if it buffs your sheet dps by a whole lot. On that note, if the barb is doing the scouting and you are just tp'ing on 'e', you should be running time warp in the free slot instead of tp, for group buff reasons. Sidenote: If there is more than 1 cmwiz in the group, then one of them, usually the higher sheet dps guy, should be running FN-Deepfreeze instead and the blue bubble instead of the time warp in the free slot.
At the end of the day, edps is measured by run-time
On not dying in vota: I just want to say that "Everybody dies, not everybody wants to admit it" ^^ There's not a single cmwiz I have seen/know who doesn't have a chance of dying in vota playing normally, so don't worry. In fact, due to the chances of dying being about the same once you reach a level of ehp/mit, it becomes ok to use SoJ and whatnot to increase dps, at least I think so. That's why we have more 300k wizzes this patch and 200k wizzes in the last patch...
This post was edited by ElijahBailey on Apr 17 2013 11:34am