Andrew, brother, I write as a great admirer of the ARP. My chief mentor was one of its most visible ministers. But, you are naive if you think the ARP is unaffected by the current controversy. Witness one of your primary seminary prof's unreserved testimonial to Norman Shepherd on the back cover of the Call of Grace, and then look at some of his other writings.
To say the OPC is similiarly immune is also false.
We all have this problem, and we all have to deal with it.