Figured out the problem, which had nothing to do w/ the BT Module at all...
Turns out the sample code for the Rabbit 3000 only allocates 15 bytes for the in and out buffer for the serial port. Since my ACL packet was more than that, and it probably had to wait to set up the connection or whatnot, it was holding the packet and overflowing my buffer. Switched my buffer size to 255 bytes and everything works great now (and a lot faster).
Thanks, Mike