The Build Planner does not know the exact rolls of each individual affix.
By default it only shows average rolls, but you can see max or min rolls too.
Also your Holy Aura is not considered in the character sheet.
As for improving the damage I would consider using another weapon.
The Last Laugh is a good weapon, but not that good for an Ailment Build.
The Armour Shred, flat melee damage and base crit do not increase your Bleed damage at all.
You are also missing highly valuable %chance to bleed on hit on weapon suffix.
I think a Zweihänder would benefits you much more, since it has almost the same flat dmg (which is only useful for the hot portion anyway).
The Physical Penetration Implicit is useful for bleed damage too.
Only downside baseline would be less attack speed, which can be mitigated and even be improved by having a good attack speed Prefix.
Overall a customizable rare weapon is alot stronger.
But I think a Zweihänder with “just” attack speed and chance to bleed on hit would probably be a dps upgrade already.
For your Armour I would recommend using the Sentinel CSA base types, Woven Flesh is a great starter item, but not really useful in endgame.
Using Winged Helm and Solarium Plate with one T5 CSA suffix can give you 100% CSA already, while still getting much more defense from those slots.
Also the crit multiplier from your Helmet doesn’t benefit Bleeds at all.
You should also try to get bleed effect and bleed duration on prefixes for both body Armour and helmet. Since they are both More multipliers for your bleeds.
Also the boots could be replaced with either cold or fire resistance implicit and maybe open up more other defensive options somewhere else.