Different X1 boxes have different buffer limits that you can see here. You might swap your box for one that has the 60 minute buffer - or if you already have one, swap it to the TV that you watch most.
https://www.xfinity.com/support/articles/x1-hub-vs-companion-box
The brute-force approach (that I use) is to set series recordings for everything you know you want to see and configure it to only save one or two shows so you don't run out of space.
