Xavi wrote:

if you want to reduce your performance, you can keep the Lifelood mechanic, but add a -1 when you ahve lost 25% of health or more, -2 when you ahve lost 50% or more and simply take a penalty die (buyt with no penalties) when you have lost 75% or more damage over your base health. it is a fairly standard system and easy to implement without breaking anything or require bookkeeping.

I had a closer look at this idea and I think the math may be scewed. A penalty die may sound bad but I believe a -2 modifier could be worse. The reason I say this is that achieving a target number of 9 or greater with a penalty die is 10.7% while it is only 8.3% with a -2 modifier. I'm no math expert so my numbers could be wrong but, even with a penalty die, it's easier to achieve a result of 9 to 11 than it is with a -2 mod (heck, a -2 mod means you can only roll a max of 9 unless you roll a double 6).