Did not work well with bcm lower / geissele trigger combo - Elftmann Tactical Ambi Speed Safety

Not sure if I’m an outlier or what but I ended up buying 2 of these liking the concept of the push button. I finally got around to installing one last night on a new BCM lower I just got. Upon function testing I found that the first trigger (Geissele SDE) pull often felt difficult and noticed that the selector wasn’t allowing the trigger to engage (wasn’t allowing the backend of the trigger to come up and move as necessary to complete the trigger pull as if the safety was still on). After some additional force it typically would go but doesn’t seem reliable to me. I immediately took it off and replaced it with an extra Radian safety selector I had. I’ll try it on a different lower and see if I get a better result.