Personally I use multi rigs for most of my fishing and have done for a number of years now, apart from I've now got two rods set up on multi chods.
I use atomic chodda hooks in 4 or 5 with a similar set up to those above (my version https://carpychrons.wordpress.com/2017/11/02/in-depth-rigs-update/ )
I did at one point, through the summer months last year get a lot of hook pulls, which suddenly stopped at the end of August for some reason. I didn't change anything as I was still landing fish and I knew that it wasn't solely down to the rig, I had been hooking small tench and bream in the bottom lip on my previous venue so the rig was fine. I put it down to exactly what BC says above, the fish are not feeding hard and just grazing, funnily enough looking back the lost fish were daytime bites and the landed were mainly during the night, likely when they are feeding harder as it's cooled off.
The one thing to really play with which will affect hook holds though, and is probably overlooked by many, is the amount of weight used (in my case putty), I've found even the slightest difference can make the hook act differently upon takes. The difference between a pop-up heavily weighted and a critically balanced one is vast. I found the heavily weighted got better hook holds, but when it comes to rigs re-setting it is nowhere near as good so you end up with potentially dodgy hook holds due to the rig being a mess on the bottom.