Your 17 cm wrist will perfectly welcome the 5970. I have the same wrist size than you, and have no problem with a 40 mm watch.
The 5970 will become a cult watch. If it is not already the case.
I don't see the problem to make the 5970 and the 130 co exist. I would rather see the problem with the 3970 and the 5970, unless you want to build a collection of Patek Chrono / PCs...
I have a rule, when it comes to brands such as Patek and a few others ( Lange, for example ): Not two watches with the same movement. Unless you want to build a collection around a theme, as I've already said.
So, I would keep the 130 and only one PC Chrono. Or the 5970 or the 3970.
Best,
Nicolas