I was pondering this ideas:
What if your ancestor was only as strong as the stats you LOST... so if you died with full tradition... your ancestor has only 25% of your stats.... so dying with full tradition gives you a very weak ancestor. On the other spectrum... dying with full change would give you an ancestor with 75% for the stats you died with... this would make a fairly strong ancestor.
YOu could play it up background story wise as that if your ancestor tried new things (full change) then you have more to learn from them.
This would most likely give innocent farmers who get murded stronger ancestors... and murders with full tradition weak ancestors... And would totally stop the whole... kill someone and drown yourself thing...