OMJ,
I'm on about my 6th build of 21876 with Calk's new 4.2 kitchen and noticed something today. Not sure how well it will work w/23504 but I noticed when i went from a 16 pgpl to 20 or 24 i got a significant increase in responsiveness. From what i'm reading in the posts this is not at all an issue with your new rom
but hey, faster is always better if possible right
(maybe you have already done or tried this but I just thought i'd throw it out there for ya)
P.S. - 16 to 20 big diff, 20-24 can't tell a big jump like 16 to 20