I have the pro-lifter installed as well. I just took a shogun class with @Bruce Cartwright over the weekend to familiarize myself with this shotgun. We did many reps of loading and unloading and I found the pro-lifter to be a nonissue. This was my first time doing real training with a auto loading shotgun and I found the repetitions in class to be invaluable.
I took a short video of unloading and select slugging… https://imgur.com/a/CfkQOZ4