Colorado,
I have 14" apes from Hill Country Custom Cycles o the stock risers. I used the Wild1 adapter plates. I had a very interesting first long ride with them. Every bump I hit moved the bars tot he rear and down. I stopped and tightened the bolts all I could without stripping them out. When I got home I removed the caps and noted that the adapter plates were not in the most ideal location.
Make sure that before tightening the risers down the plates as centered as possible (one on top other on bottom)<-----not sure that makes sense. With an even amount of gap front and back. Then tighten the riser caps down similar to a engine head, a little on the front then a little on tn the back. Make sure the gap stays equal between the plates as you thighten it. A small screwdriver will help keep it in position.
After the second try I never had a problem again. Rode to Sturgis and back that year and hit some good sized bumps but no still not bar movement.
If ever start having problems again, I am buying new risers. The problem at the time wasn't money, I just couldn't find any other risers I liked better. I think your steel heli-coils will do the trick to replace the threads in yours. Don't forget the Loc-tite!