No, having complete files for 2 years, along with 40K TTs and hour long hill climb TT's is really the most solid predictor of FTP, IMO. After all, a MAP test is still a 'predictor' of performance, where as a 55 minute hill climb is, well, pretty close to the definition of FTP.
p.s. to Andy--I send an e-mail to you with the info on the files I sent.