Initially I received the Stamina recovery from the 5 piece bonus. Upon switching drinks I stopped receiving the bonus. I then created the drink I initially used and still did not receive the bonus. I've tried every drink of every level I know and several made by guild mates and still do not receive the bonus.

The unique rings allow for stacking of multiple glyphs. I currently have the original reduction in stamina abilities plus weapon damage. It suggests on the enchant left window that If i attempt to add another glyph it too will stack, instead of being replaced.