I believe that it more than just the bollard size but I have really studied this yet since mine worked flawlessly from the start. My thought is that while the larger bollard should give you more friction by first impressions and single thought processing (no disrespect intended). For every action there is a reaction and my thought is that since the bollard is larger it makes contact sooner, thats a given. What I think may be happening next is that because there is less room to move that the upper link may not be pivoting around as much. I think this is a very small amount of less movement but this in my opion would cause the "S" shape to be lazier by a small fraction. We all know how important that upper "S" is, the friction that it causes is part of the reason we change pivot points and modify lowers. The RR is very similar and is also being dialed in and modified by many of us. Just my humble opinion but the next time your BDB or RR doesn't grap right away look at where your hand goes and what you do to correct it.