Get the addon affdots, you seem to be struggling with wrapping your head round dots and stuff so just get that and follow what it tells you, simples.
The long version is you need to understand how powerful a certain proc is, and know how powerful your current set of dots are. In terms of Wush, I'll often refresh my dots at around 5 stacks, haunt, then malefic grasp until 10 stacks, at which point I refresh again then haunt once more. How you refresh depends on how many shards you have.
I'm uncertain if a 10-stack wush is worth dropping for an UVLS, as I only have the raid finder version which I use for demo. When I played affliction I had cha-yes to accompany my Wush so it was easy.
TLR - Get the addon affdots and refresh when it tells you, hopefully someone more experienced with affliction UVLS can chime in.