I spent the time to read ALL of the posts in this thread, and was formulating a nice explanation on the "hows and whys", but I just don't want to waste the time of all that typing so instead this is what I have....
Don't fly nose to nose with anyone !!! This is NOT avoiding the HO it is encouraging it !! If you don't give "them" the chance to HO or ram you they DON'T !!
Stop ramming people and you won't have to worry about the collision model!