I have an idea. Its a lot of work but it might save you some $$
Check your clearances between the valve and the lifter on your exhaust valve. Make sure they are at .020. If they are, try tightening up the clearance...say .010. This will allow the exhaust valve to "raise" up just a little more when the ACR kicks in. This could tell you if your ACR is not working properly. I did this to a 107 to soon find out the ACR isnt quite right.
This is obviously a test and shouldnt be run this way for the long run. It will cause you to lose power.
Its just an idea. Hope this helps.
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