For this support component, I wanted to perform a modal analysis to see what the natural frequencies were at the relevant modes. I started off being choosing 15 modes. Then, I increased it to 50 when the mass participation was still very low. I'm up to several hundred modes and I can't get the MP past about 40%.

Any thoughts on this? Is it possible that I'm setting up something wrong? Attached is the model and the natural frequencies for the first few modes.