Improved Deception +xx still does not work correctly. I thought this was fixed under a prior patch when you fixed vinelash bracers?
Tested with newly created epic/legendary golden guile, both give +5 enhancement bonus to bluff, not +17 or +20 as stated. In image below I have both Devilscale bracers (Improved Deception), and Legendary Golden Guild (Improved Deception +20). I am still only getting a +5 enhancement bonus to bluff.
I think I see the issue. It looks like Improved Deception is giving another +20 source of Bluff via the Improved Deception +20. But it is also a Competence Bonus, so it's basically not adding anything to the Golden Guile, but any other item without Bluff 20 on it already will benefit from the +20 to Bluff from Improved Deception +20.
:: edit minor corrections ::
However, that's what's happening. I am unsure if that's how it's intended to be working; +20 Competence to Bluff from Improved Deception +20 and also a +5 Enhancement Bonus from it as well. Or if it's all supposed to be +20 Enhancement bonus to Bluff.
Need Dev answers for that.
J1NG
The tooltip for the Improved Deception +20 states it gives a +20 enhancement bonus to bluff, so you should be getting both the +20 competence and a +20 enhancement bonus, however it doesn't seem to apply (or if it does it is also typed as a competence bonus). So either tooltip is wrong or the bonus is.
Improved Deception +X currently has 2 bugs:
1) It is providing +X Competence bonus to Bluff (should be Enhancement Bonus)
2) It is still providing the old +5 Enhancement bonus to Bluff regardless of the effect's tier (this bonus shouldn't exist anymore)
As such, if you have an item with +10 Bluff equipped, and then equip an item with Improved Deception +20, your Bluff ends up increasing by (20-10)+5=15, whereas according to the effect's description it should simply increase by +20.
Recently updated items, such as the Vinelash Bracers, are still affected by both of these bugs, which means that all items with Improved Deception +X are affected by them.