I don't think that Philharmonic has that option to use a 64bit version, prob cuz that's the only format it runs in. However, I did try bridging them (and using the extended memory of FL) and I did get better results, but now I get some kinda weird popping, crackling sounds, and I have an example track to show you guys what I mean =(
http://www.mediafire.com/?zw9wsh14e18bc89
EDIT
the issue is most prevalent at 1:28-1:48 or so.