Oh my. 16 V and 32 V. The bus voltage I am working on is around 100 volta max. I can't use INA219 anymore, can I?
What project are you working on use such a high voltage?dc or ac? are you using ext shunt? but you have too due to high Vbus, maybe you can try voltage divider apply before v+ & v-, (if you using ext shunt) monitor the Vshunt and play around with the coding to match with your output.
Have you seen this library? https://github.com/phishman/LTC2946