Hmmm 300xxxxx range? Wonder what's there, I always were interested only in 20000000-21FFFFFF, maybe the one you search through is GS memory, but if that soo, it'll not be too usefull, the result in gs can look same/similar in each game, but then again, if you cannot change it inside game memory range couse the engine doesn't store it anywhere to simply freeze it, not much of a widescreen patch from it. You could look what writes to the adress you find, maybe it would lead to anything better.
If the X and Y axis are stored near each other you can also search using wildcards, just search array of bytes with ?? for unknowns, just remembering to reverse bytes as this 0x3f4ccccd would look as cd cc 4c 3f in memory, as an theoretical example if Y axis would always be 2 bytes after X axis, and they would be always the same, you could search for such array of bytes(considering X=0x3f4ccccd and Y=0x3f6eeeef) "cd cc 4c 3f ?? ?? ef ee 6e 3f", which by searching for this pattern in choosen memory range could make you write a script for cheat table or trainer that would always work, even with the value stored in different adress every time, that's called AOB scan(array of bytes scan), and is fairy popular way of making universal trainers nowadays(ie. working in all future patches of the pc games as long as the pattern doesn't change) so it should have lots of tutorials if any needed, the bigger pattern you find, the more sure it'll be, soo check memory view of the adress you find, copy memory around, after it changes, repeat and compare searching for pattern, it could be something nice for a start, especially if a pattern would repeat in more games.
I had no luck, searching around that range now in Tales of the abyss, only found some graphics placement and a few crashes;P, but maybe it's just me, hopefully at least maybe some info from my post will turn usefull. Ah speaking of the devil;P the value strangely starts from 3f4... couse that's how float around 0.8 looks in hex;P, try for example
this, if you don't have any calc for it(through CE can do that, if you get the adress type as float, and switch between hex/dec).
Anyway nice work, keep it going.;3