Also, it could be a plugin in your Cubase project causing problems, you never know.
I would be curious to see the results from you running Latency Mon. I had a constant latency on my AMD machine of over 500 (which is horrible) and all I had to do was to downgrade my LAN network driver from latest to a 2015 version. Now my latency is 20-30 and just so more responsive (anything less than 100 is very acceptable). Sometimes it is just small things that fix everything. Your computer should be plenty for recording a bunch of tracks, no need to add extra discs to even out the load.