I would say you are definitely tripping the accutrigger safety. I know it sounds like the pin is dropping, but if there is no dent in the primer, there is no pin drop.

One way to know this has happened is you'll notice that the accublade is full forward and locked right after you've had a FTF, and before you lift the bolt. This is a sure sign you've tripped the safety and there was no pin drop.

Some things you can do to remedy this: First of all set your spring gradually tighter until you can get a reliable break without tripping the safety. Always pull straight back on the trigger. Do not side load it. If it still seems too sensitive to tripping, you can shim the accublade with a shim kit from triggershims.com.

You can drop your pull weight significantly by putting a small amount of never seize in the notch on the sear. This allows you to set your rear spring to a reliable break and still have a very light break. You can get a varmint trigger to break at about a pound by using these hacks, but you'll have to be much more careful in closing the bolt, as that is the number 1 reason for tripping a lightly set accutrigger.

If you want a super light break, you can buy a used red blade accutrigger off the boards and install it on your action. That'll get you down to under 6 oz if you use the above hacks.

When at the range and you notice the accublade is locked up, simply raise the bolt and close it carefully. This will reset the safety blade. No need to cycle the bolt and eject a round.