Except the issue happened after a game update. Looks like you intentionally skipped that fact. Heck, even a faster gpu is fine with the R5 1600.
the thing is regardless of update any current ryzen will struggle to maintain fps needed for such a high hz monitor. some are suggesting upgrade to cpus which will still struggle. currently only intel at that range will give the high end performance he seeks. so keep the cpu you have then see how the new amds are when they come out. they are supposed to match current intel chips ipc and have more cores. buying anything now is daft when in couple of months you could have what you seek.