Help me theorycraft with Harrow?

Ok, so we all know the standard Harrow; 142 Duration, 115 efficiency, 52 range, 211 strength, only redirection.

But... the tanky until poisoned crit machine support frame obviously has full tank applications, and I feel like there's a way for Harrow to surpass Chroma in tankiness using his thurible and penance to their limits.

The idea is a bit complicated, but here it is in all its infant glory -

• Vitality/Vigor, possibly no Redirection; base is enough to sustain penance
• Possibly steel fiber for added tankiness
• Thurible for energy regeneration; we want a very fast thurible to maintain our energy income
• Rage combines with penance for even more passive energy regeneration; fuck off, energy leech eximi!
• Quick thinking springboards off of this immense amount of energy regeneration for near-immortality (primed quick thinking when, DE-kun?)

The issue here is I don't fully understand Thurible's interactions with the various stats, because the MR2s who run the wiki are very vague about it all;

• Does positive duration slow down your energy consumption speed, or speed it up?
• Does negative duration slow it down or speed it up?
• Does efficiency interact with it at all? If so, does it speed/slow it, or simply convert energy more efficiently?
• Does power strength affect Thurible at all?