No flames here.
I welcome all logical discord for this interesting problem. It would be helpful to provide solutions than issues. Thanks.
I think that a few points may help, in understanding this.
1. I utterly failed to provide any CONTEXT, for the passages I cited. Although my excuse is that the post was already too long, knowing the context of each verse is necessary for understanding any verse.
2. The context of these verses will (I believe) show that each is about a singular event. That is, each is describing one situation, and what God did regarding that event. Thus:
3. It may be, that none of these are describing a general characteristic of God. Maybe we must look at all of these verses, and many more, before we can make definitive statements abut whether God can or does change His mind.
Hope this helps.
DG