Also bleed deals 100% of your attacks DMG. But you can increase your bleed DMG by many % such as by Vampiric Touch set affix and epic affix Bleed DMG%. Blistering makes fire dot do Bleed DMG but it is best used in PVE since in PvP, perseverance opponents can reduce the dot by 40% or 80% so it deals a whole lot less dmg to opponents.
Blistering on fire dot when using immolate by elemental crits on Fire element can also be increased in % DMG by using Vampiric Touch and epic affix 50% bleed DMG. Best used in PvE along with Crushing blow and Crushing Flames to defeat enemies easier. On PvP, i would recommend Shock+ bleed. While bleed is still affected by perseverance, it's not as much because the shock attack is unaffected by perseverance being a debuff element so bleed is still useful.
Also In PvE, shock+bleed is useful with Electrocution, crushing blow, vampiric touch, hirling stack debuff with your own shock stack debuff, bleed dmg , weaken and repeat attacks. Shock+Bleed is a deadly combo. Same with fire and bleed.