We prefer to leave the skin on the sweet potato for the added fiber (even with skin included, this is still a low FODMAP food). If you prefer to chop and boil your potato to cook it, when you cook it you will create resistant starch. If you eat this cold, you will be eating resistant starch which will likely set off your symptoms. Always reheat potato (and rice) before eating. This breaks the bonds of the resistant starch.
You may replace the pine nuts with walnuts or macadamia nuts, or you may omit the nuts altogether.