People say that you can infuse anything up to 1/3 of the original value, so if your piece of gear has 10000 AB, you can infuse it up to 13333 AB max. Can it be the case?
You can check your item at u.eq2wire.com The tooltip of an equiped item shows deity/physical/Bonus infued stats. Stamina is only infused up to ~50% of the original value. With the silent infusing change at GU109 (march 2019) stamina was capped too
Not sure if that's the case or not. The first time I used bonus infusers on these 2 items, the text listed all but stamina. Looking at eq2wire, https://u.eq2wire.com/soe/character_detail/884765508955, the Spore Covered Bangle, and the Brightsending Exactor's Light in the Dark charm show they had bonus applied.