Bro. I opened the save by SGE and then I loaded the file which you said LOQO2. I was able to put the maximum amount of items, thanks!
But still you just can change amount of ruby coin and Dimensional shard, but didnt change the actual amount of that 2 item...
if you wanna do, you simply edit your save file with RPGM save editor and go to advance, switches and value, and find the 2 item that i mention it before, change it as you like. note that you need at least one of each ruby coin and dimensional shard to be working. once you used ruby coin/Dimensional shard, they would completely lost. and when you need to use it again, you need to do the same step...
note that you can change the value of heart of most of the girl, nad any resource on it..
just make sure you made a back up, cuz as we know, a value is the sensitive thing you can mess with...