Like I said, what I stated is not the rule its an opinion. I never said there was an 'optimal' weight. I simply said that 1300g is not the weight most seek for a breeder female. This is simply based on my own experience and based off of many other breeders that I know. Also for the person who said that the weight doesn't matter as long as the snake has the proper age and body size, I can't seem to make much sense of that. I understand the age part but body size comes with weight so by saying they need the proper body size is basically the same as saying their is a proper weight.
So yes I know that breeding at 1300g is possible and can be done successfully but I personally believe it is better to wait until 1500g or more and I will continue to recommend that to anyone who asks.
But to get back on topic, I believe the two have decided to not make the trade so with that said I believe you made the right choice. If your looking to trade or sell your pastel calico, I believe you can get something much better out of it. Good luck with your future breeding plans.