By no means is anyone pointing fingers or blaming anyone but there are way to many variables that come into play as to why your last rifle was less than accurate. Could it been made to shoot..nobody will know.
At this point, I see that you have a couple options. Buy a used rifle off of a friend that you know is a good shooter. Spend the money on a custom rifle
or have an existing rifle rebarreled. No guarantees on accuarcy but I bet if you go to a good gunsmith they can provide some level of acceptance. When I politely asked what my gunsmith's level of acceptance on a "accurate rifle". He smiled and said "The gun will shoot better than you can shoot it. If not, I'll give you one of mine that does". The other option is try your luck with another "guaranteed" rifle from HS precision, Sako, Weatherby.
BTW, Kimber's level of accuracy is 1.5" @100 yards.