Thanks for making the investment. The Taiwanese will be grateful too. They are nice people. A humble nation. like a shoal of minnows living next door to Piranas. Living in Canada it's hard to imagine.
Anything thinner than 11.7 will make for a more effective grapple line. I personally like 10mm. Weighs nothing, takes up less space, throws further, less drag and so on. It's also worth remembering that if you can get level or even slightly above your target, you'll get much better accuracy and distance. All the best.