last minute TT bike change?

Took the old yellow epx out for a spin last night. This is the bike I had before the LOOK 486 came along. Rolf Vector Pro tubulars with Schwalbe top shelf tires on them.. Campy Chorus drivetrain.. 172.5mm cranks!

First I was amazed that I ever raced on the thing.. Then I marveled at the narrowness of the handlebars. Then I noticed how absolutely smooth the thing rides.. Shifts are whisper quiet.. Tires seem to float  across the road.. All brake and shift cables neatly concealed in the bar tape.. Then I got to thinking about whether I'd be hurting or improving my Bob Beal TT time if I decided to use it Saturday afternoon.. There are advantages.. but I'm fearful of injuring my knees or developing an unexpected pain in my back or a pinched nerve.. I'd also be sacrificing the use of my Powertap (such a dirty word these days.. especially for those who've been racing since the Lemond era, as I have been) Big deal, right? It IS a big deal. I'm not a machine that knows how hard I'm pedaling instinctively.. When time trialing is your weakness (as it is for me), you need to know how much effort you're putting out. Months of trainig with the Powertap has established my CP6 to be about 325 watts. So.. it's simply a matter of keeping my eye on the average watts from beginning to end. This avoids blowing up and it insures that I go at a rate that I've proven I can sustain, and it also tells me how much and when to light the afterburners to average it up in the final mile. As for aero gear, I have the Profile clip-on bars and I may tape over the vents in my helmet, lose the bottle cages, and buy or borrow a pair of lycra shoe covers. Oh and the skin suit.. These are all enhancements over last years attempt. So.. I guess I wish my PT whel was a Campy at this point. Switching bikes might be a poor choice.