Ill try and post as much as I can while testing this. As we all know there is a certain chance of GA dropping when ure fighting a mob close to the GA lvl. I may have found a way to make the GA drop more frequently. It involves having lots and lots of bags crammed with nano-discs in the same ql as the GA ure looking for. I sucsessfully managed to find 2 ga 2's and one nullety-sphere in 1 hour while having my inv crammed with all the ql 90ish nanodiscs I could possably find.
There might just be a chance that the one nanodisc u dont have in ure inv have a higher chance of appearing... I had 9 bags with all the different ql 60 nanoclusters once and instead of finding hundreds like I allways do I found only 2 in 3 hours of hunting ql 60 plants.
I know this sounds very very silly but it wont hurt trying it out a little