Sorry it took me a bit to get back to you! I hadn't checked the forums in a bit.
I took a look at the data, and it looks like the spikes are starting right at hop 2. If you double-click on hop 2 in your trace, and scroll back - you can see that the same funky pattern is visible in hop 2. However, if you double click hop 1, the pattern isn't there. This means that there's either some lag happening in the connection FROM hop 1 TO hop 2, or there's some lag happening right at hop 2.
Usually, hop 2 is either your cable modem, or it's the ISP's equipment. I would recommend getting in touch with your ISP and sending them the same share page that you sent me - and let them know the problem is starting with 10.167.32.1. They'll likely be able to identify the right device and they should be able to look into it!
I hope that helped - best of luck to you in getting this figured out!