I bought HyperX HX424S14IB/4 Impact DDR4, Black 16gb (2x8GB) and now I have 16 GB of ram running at 2666 MHz and 15CL (dual channel) which looks like a slight upgrade from the 16 GB stock ram at 2400 MHz and 19CL but it is NOT. I noticed a huge difference in games and almost no more significant fps drops like before. I highly advise you to replace your 8GB stock ram with new ones at a lower timing and supporting XMP to run at 2666 MHz (yes this laptop surprisingly supports XMP). The ones I linked work perfectly with my 7567.
Here are my benchmarks after the upgrade: https://www.userbenchmark.com/UserRun/33849173