Mine were produced by Adirondack Manufacturing. Still VERY strong.
Could be. There were probably different “runs” in each “generation”, some may be stronger than others. To be clear, I have not noticed any of mine losing strength over the years. All of my Adirondack (2nd gen) CDRs were purchased by the dozen within a span of about 3 years. They never lost strength from the day I bought them near as I can tell, and I thought that was VERY strong. Then I got ahold of some first gen originals.
None of this would matter if they were all reliably holding beavers. I was having beavers caught on video, that I could clearly see had a good catch (both front and rear foot catches) that were empty at the bottom. In almost every case I caught that same beaver again and could clearly see the scrape marks, further confirming that they were just flaty pulling out. I started making a mark on each trap that lost a beaver each time it lost one. Some of my Adirondack traps got up to 3 and 4 marks, while I noticed that older MO pans had none. I came up with a setup to actually measure the spring strength, and started tinkering with the Adirondack traps to get the spring strength to match my originals with MO pans, and it drastically reduced the pullouts.
Im not implying that your Adirondack traps aren’t holding, they may be stronger than mine or have some other differences. If you arent losing significant numbers of beaver, then there is no problem to solve.