It sounds like you already have the bike you need. Unless you are going for record attempts or national championships, the weight won't make a bit of difference. Ride and enjoy! The requirements for racing and randonneuring are quite different. So, if you do decide to get a new frame, I'd look at something for randonneuring since you already have a racing bike. The good news is that there has recently been an explosion of interest in randonneuring designs and there are several good bikes on the market (mostly lugged steel).