Try disabling the strict mode on your Geo-Filter and Ping Assist for a bit to see if those are actually causing the ping spikes. Sometimes having the filters dialed in too tight can lead to packet loss. It is also worth checking your Congestion Control settings to make sure your Bandwidth Allocation isn't throttling your gaming traffic too much. If things smooth out with the filters off, try slowly expanding your Geo-Filter radius until you find that sweet spot between low latency and a stable connection.