Endurance Discount set bonus question

[Aaronar]

I really wasn't sure where to ask this, sorry if it's in the wrong place. I've slotted a few IO sets giving an endurance discount, yet my combat attributes list a smaller discount than the set bonus states. For example, 5 piece Annihilation gives a 3% discount, yet I'm only getting 2.9%. Unbreakable Guard lists 2.5%, only getting 2.43%. Reactive Defenses 3.75%, only getting 3.6%. Is there some sort of diminishing returns or sort of ED system at work? Even Mids is listing a full discount so I'm unsure what's happening.

[merrypessimist]

Sounds like the set bonus values are being subjected to AT scalars, maybe? 

[Omega-202]

It's due to the way discounts and reductions are calculated.  A 100% enhancement value in rcharge or endurance reduction doesn't eliminate the cost or recharge, it halves it, otherwise the whole enhancement system would breakdown.  Reductions are calculated as 100 ÷ (100 + enhancement %), not as 100 - enhancement %.

 

So in your 3.75% example, its calculated as 100 /(103.75) = 96.386 and not 100 - 3.75 = 96.25.  

 

In effect, it turns into a diminishing return, where 100% reduction is half, 200% is a third, 300% is a quarter etc.