1)when asking mechila from a deceased person not by the grave but with a minyan,what if i am unsure if i need forgiveness?should i still say chatasi lashemetc., or should i just ask mechila?2)if i walked with tzitzis out in a bais hakevoros,do i need mechila?3)and since i dont know where exactly i walked,can i just ask mechila from whoever i wronged?
1. You can say the regular nusach.
2. No, there is no need for mechila. The concept of lo’eg lerash is not “personal,” but is rather a general concept of disrespect for the deceased. There is no need for personal mechila.