Actually somewhat pleased with that bench, as I didn't have a spotter to pull it out of the hole for me. Figured out why it felt like my forearms were the issue - it was the pronation. With my grip set right, it has become very obvious (and much more making-of-the-sense) that it is in fact my triceps that are the limiting factor. My sticking point is about 80% through the movement. Weight powers off the chest and gets stuck shortly before locking out.
I'm glad you are getting your form worked out. I still think it would be good for you to post a video to make sure everything is good. If you have good form, at least you will be working your weak points when you are doing the lift.