It’s pretty well documented on the forums that latency goes pretty wonky when you start to load more than 9 F300 SM’s onto one ePMP3000 Sector. Here’s one thread as an example. On the one tower I went from ePMP1000 with F200 to ePMP3000 with F300 the latency took a major dump. Every tower I run ePMP2000 with F200 the latency is much more stable and latency kills voice traffic.