Nuttie!!!!!!!!!!!!!! an 87 Peugeot?? and it's your "beater bike"??...you Bite your tongue Ms: you're-not-My-captain-anymore!
Actually it'll be tough replacing those things on the Peugeot (which is NOT my beater bike btw). Especially if it was one of the models actually produced in France. I haven't have any problems with the rails or the seat clamp on mine so far - I'm using the Specialized BG saddle. (seriously thinking about a Brooks tho...ya'll keep giving it such high marks) I have had problems with other things - like a rack. I had to jury-rig something to make it work since my old sweet baby doesn't like the new-fangled stuff!
As for the PIA issue: don't know what to tell you hun. I can't ride with the nose tipped down on any of my bikes - I always feel like I'm going to slide off!
I did try and ride the Navigator for the winter (the "comfort" bike) after riding road bikes all summer, but it was murder on my shoulders and back - guess it just doesn't fit me anymore - or maybe never did. I went back to the Peugeot with a rack on and haven't had any problems since.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"