Fast forwarding tips

So I've been using DVRs pretty much since their inception and I find fast forwarding past commercials on Xfinity recorded shows frustrating to say the least. I've used various devices and streaming devices and Xfinity's playback controls are not the worst but definitely not the cream of the crop. While fast forwarding recorded shows, it sometimes jumps back a few seconds when hitting the play button and sometimes it does not.  Fast forwarding speed does not seem to matter, it's inconsistent and is becoming increasingly frustrating. In researching this issue, I found that some remotes can be reprogrammed from a 5 minute skip using the pgup button to 30 seconds but it did not work on mine (exit exit exit 0030). I have an XR15 remote. Help!!!!