What are you amping the 325s with and what quality source? I have added the Gcush to mine and love it, but my amp is quite bassy so offsets some of the bass loss you get from the Gcush. If you have a way of upping the bass EQ that may pay dividends. G cush does improve the imaging and soundstage for me though. Great separation of detail.
I have also noticed the 325s are very unforgiving with poorly recorded and lower bitrate tracks.
In short, keep burning them in (mine took a good 200 hours to mellow out) and try the Gcush if you have the $ spare. I love it.
200 hours? Wow, well I guess we do have a way to go then!! I am using my Headroom Max amp, really good solid state amp. I also have a relatively cheap tube amp I use also. Like I said I am not giving up on them by any means, especially after the 200hr comment. I guess I was expecting them to be remarkably better than my 225i and they are (so far) just marginally better. I will say however I have heard a couple songs on them that they just make me say WOW. I don;t know exactly why these sound SO good. Someone (Dubstep Girl I think) told me they were very revealing of the source and maybe those are just really well recorded cd's.