Dont cut them off. The plant knows what it wants and doesn't. Give them a gentle tug. If they come off then discard, if the dont then leave them. I leave everything on until I know I need to prune for trainings sake, or if it is inefficient. Inefficiency can be caused by a leave which is more than 50% damaged. If it is that bad Id consider removing it. If it is not that bad, and just consists of burnt tips or other damage which does not consume more than 50% of the leaf, then continue as planned while trying to find the source of the damage and curing the issue.