there are a lot of people that have proven that getting the highest possible int is the highest dps possible, however, that only applies if your not going over or under accuracy cap, if your lowering accuracy and a small amount of int (10 ilvl difference max) but not going under cap, then you will increase dps by a small margin, the same applies in reverse when increasing your int.
the part about how your garuda only missed once or twice, doubtful, you only noticed it once or twice, more likely. also i did some fairly deep theory crafting about a month ago on accuracy vs crit hit rate and det, and accuracy won out, granted it wasn't a very large margin. i dont want to fill up this thread with off topic info about it so go to the
original thread if you want to read about it.
anyway, the main reason most summoners prefer determination post patch 2.2 is because thats just how the itemisation handed it to us to avoid spell speed, bard gear is exactly the same, not many are super happy about it but we work with what we have.