Last night I kept running Wayrest to farm some gear and I noticed that in more powerful (better oiled?) groups, I had more sustain. I don't know if this is because of buffs or because with a poor tank there is more dodge rolling and general chaos.
After a group where sustain was an issue, I enchanted two extra rings with sustain recovery, so I could swap out weapon damage enchants for sustain. This works great! Now I can easily tune weapon damage vs sustain depending on the circumstance.
Also, the decision to chug pots means you don't really need as much sustain. Wearing both weapon power rings makes a noticeable improvement in damage along with the extra crit from the pots.
What method(s) do you use to tune your build? Or do you not bother?