Heavy Smash for Tank Build

With the discovery of Save Combos, the once unfavored skill, Heavy Smash, has found its place in Brawler builds.

So far, as a Tank Brawler, I'm enjoying the high aggro and damage reduction Heavy Smash brings. Some hate the slow animation, but cutting Roga's Dash by -300dmg is incredible. The Lethargy proc rate seems decent enough at level 1. But I'm left with a question: What does maxed HS brings?
To those have tried maxing Heavy Smash before, what are the additional effects, other than increased damage? Does it proc even more? Higher attack reduction? Longer debuff duration?

 

used this concept on my xbow+knuckle v3 build, by default it has +50% Lethargy Effect probability, at Lv.1 it hits like 6-7 out of 10.
i'm guessing that at Lv.5 it's on max probability and maxing it will only increase damage.
no data about the debuff duration, but in case of a spammable 1 MP Bar combo, duration even at 5seconds is enough.
lastly, there is no visual marker if Lethargy is in effect, you can only notice it when damage you receive is reduced significantly.
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What is your hs combo? I'm in the market for a new one for my tank, and I'd be interested in hearing yours. ^^

 

My combo is Smash> HS save > Sonic consec > Shell consec > TK smite > Earth swift
I'm thinking of replacing Earthbind with Holy Fist, so I can put Swift on Sonic Wave.
TBH, the combo is kinda slow and not suitable for miniboss. But so far, I can hold aggro against Infinite Snipers as long as my combo won't miss too much or get interrupted very early. Sadly a Staff Brawler that can spam Smash> Impact> TK> Sonic 7 times in a row, out-aggro'ed me by a large margin.

If you don't care about damage at all, Putting Swift on Sonic Wave and Shell Break then TK consec is a great alternative.

 

How much mp does this combo use?

 

100MP
An explanation of how Save tag works: http://toramonline.com/index.php?threads/the-great-save-combo-tag-a-short-explanation.6163

 

Interesting.... Cool, thanks for the info! ^^