Well, I wish I had kept checking my Success Rate with the Fabled (ilvl 210) stuff before my Desynthesis skills got too high. But now that BSM is at 190, it's impossible for me to go back and check without literally resetting, so that's what I meant by too late. :/
EDIT: Skip to the bottom for the interesting part. This original post is just showing my thought process. Also, HAHA, I FORGOT THAT THOSE DEATHBRINGER CHANCES ARE WITHOUT CAREFUL DESYNTHESIS BUFFS. Still, that doesn't invalidate any of this.
To be honest, the "-20 rlvl" part is largely a theory using what tiny bit of data I had for that and assuming they didn't change a ton from pre-3.2. The rest of the table after that is almost 100% confirmed. However, I'm not completely confident the lower threshold for the second line (30-50%) is 20 skill levels; it's just what makes sense.
What do I know for sure is this: For at least 10 skill levels under the item's ilvl, Success Rate increased by 1% per level until I matched the ilvl. Then at the ilvl, Success Rate increased by 2% per level until I was 10 skill levels above the item's ilvl. At 10+, Success Rate increased by 1.5% per level, seemingly all the way to 100%.
I think I might be seriously confusing myself and others like an idiot because I'm viewing it from the perspective of +Success Rate % per level, and you're viewing it as Actual Success Rate by looking at the difference of Success Rate % per Level from 50%. It basically ends up as the same thing, though your perspective is more useful, but then it gets weird when you look at how Deathbringer (ilvl 210) is at 29% at 189 Skill, then 30% at 190 Skill. 189 Skill is 21 under, yet by going from 189 to 190, 20 under, Success Rate only increased by 1%, from 29% to 30%, instead of 2%. But then, that makes sense that 20 levels under would be 30% because 30-50% is 20 percentage points, and Success Rate increases by 1% per level. So...uh, I feel like I'm missing something extremely simple and obvious here.
Oh duh, the only logical answer here is that I am wrong about 20 ilvls being the lower threshold. For Deathbringer, because 189 Skill is 29% and 190 Skill is 30%, then that must mean the +1% Rate per level trend must start a lot sooner than I thought. Otherwise, 189 skill should have been 28%. It's likely that the lower threshold is 30 under rlvl after all. And for that matter, I think I was typing the ends of each threshold in a confusing way too.
So here's what it could be:
To plug these numbers into a theoretical example: (excuse the repetition)0-18% (-40 ~ -31 rlvl) = +2% Success per Level Increase
20-49% (-30 ~ -1 rlvl) = +1% Success per Level Increase
50-68% (+0 ~ +9 rlvl) = +2% Success per Level Increase
70-100% (+10 ~ +30 rlvl) = +1.5% Success per Level Increase
Assume a ilvl 150 item. At 119 Skill, 31 under, your Success Rate would be 18%. Going 119-120 Skill, 30 under, would increase it 18-20% because you still gain 2% per level here. 120-149 Skill, 1 under, would increase it 20%-49%, 1% per level. 149-150 Skill, equal, would increase it 49-50% because you still gain 1% per level here. 150-159 Skill, 9 over, would increase it 50-68%. 159-160 Skill, 10 over, would increase it 68-70% because you still gain 2% per level here. 160-180 Skill, 30 over, would increase it 70-100%, 1.5% per level.
Or to rewrite the table in a better way:
Of course, this is all only for Level 60 items as far as I know. Who knows how really low level stuff was changed. I'm not spending the time to do all that. Sorry.
- -40 ~ -30 rlvl = 0-20% Success Rate (+2% per Level)
- -30 ~ -0 rlvl = 20-50% Success Rate (+1% per Level)
- +0 ~ +10 rlvl = 50-70% Success Rate (+2% per Level)
- +10 ~ +30 rlvl = 70-100% Success Rate (+1.5% per Level)